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Finding the Fourth Proportional to 579,272.40, 868,908.60 and 390,315.60

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Solution

The fourth proportional to 579,272.40, 868,908.60 and 390,315.60 is: 585,473.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,272.40 : 868,908.60 = 390,315.60 : x
  2. Step 2: Convert to fraction form
    579,272.40/868,908.60 = 390,315.60/x
  3. Step 3: Cross multiply
    579,272.40x = 868,908.60 × 390,315.60
  4. Step 4: Simplify right side
    579,272.40x = 339,148,581,554.16
  5. Step 5: Solve for x
    x = 339,148,581,554.16/579,272.40
  6. Step 6: Final answer
    x = 585,473.40

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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.