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Finding the Fourth Proportional to 868,139.40, 1,302,209.10 and 307,230.60

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Solution

The fourth proportional to 868,139.40, 1,302,209.10 and 307,230.60 is: 460,845.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    868,139.40 : 1,302,209.10 = 307,230.60 : x
  2. Step 2: Convert to fraction form
    868,139.40/1,302,209.10 = 307,230.60/x
  3. Step 3: Cross multiply
    868,139.40x = 1,302,209.10 × 307,230.60
  4. Step 4: Simplify right side
    868,139.40x = 400,078,483,118.46
  5. Step 5: Solve for x
    x = 400,078,483,118.46/868,139.40
  6. Step 6: Final answer
    x = 460,845.90

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.