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Finding the Fourth Proportional to 78,877.80, 118,316.70 and 72,426.60

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Solution

The fourth proportional to 78,877.80, 118,316.70 and 72,426.60 is: 108,639.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,877.80 : 118,316.70 = 72,426.60 : x
  2. Step 2: Convert to fraction form
    78,877.80/118,316.70 = 72,426.60/x
  3. Step 3: Cross multiply
    78,877.80x = 118,316.70 × 72,426.60
  4. Step 4: Simplify right side
    78,877.80x = 8,569,276,304.22
  5. Step 5: Solve for x
    x = 8,569,276,304.22/78,877.80
  6. Step 6: Final answer
    x = 108,639.90

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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.