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Finding the Fourth Proportional to 78,612.40, 117,918.60 and 39,246.40

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Solution

The fourth proportional to 78,612.40, 117,918.60 and 39,246.40 is: 58,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,612.40 : 117,918.60 = 39,246.40 : x
  2. Step 2: Convert to fraction form
    78,612.40/117,918.60 = 39,246.40/x
  3. Step 3: Cross multiply
    78,612.40x = 117,918.60 × 39,246.40
  4. Step 4: Simplify right side
    78,612.40x = 4,627,880,543.04
  5. Step 5: Solve for x
    x = 4,627,880,543.04/78,612.40
  6. Step 6: Final answer
    x = 58,869.60

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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.