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Finding the Fourth Proportional to 72,436.80, 108,655.20 and 65,875.80

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Solution

The fourth proportional to 72,436.80, 108,655.20 and 65,875.80 is: 98,813.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,436.80 : 108,655.20 = 65,875.80 : x
  2. Step 2: Convert to fraction form
    72,436.80/108,655.20 = 65,875.80/x
  3. Step 3: Cross multiply
    72,436.80x = 108,655.20 × 65,875.80
  4. Step 4: Simplify right side
    72,436.80x = 7,157,748,224.16
  5. Step 5: Solve for x
    x = 7,157,748,224.16/72,436.80
  6. Step 6: Final answer
    x = 98,813.70

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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.