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Finding the Fourth Proportional to 72,436.80, 108,703.80 and 42,823.20

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Solution

The fourth proportional to 72,436.80, 108,703.80 and 42,823.20 is: 64,263.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,436.80 : 108,703.80 = 42,823.20 : x
  2. Step 2: Convert to fraction form
    72,436.80/108,703.80 = 42,823.20/x
  3. Step 3: Cross multiply
    72,436.80x = 108,703.80 × 42,823.20
  4. Step 4: Simplify right side
    72,436.80x = 4,655,044,568.16
  5. Step 5: Solve for x
    x = 4,655,044,568.16/72,436.80
  6. Step 6: Final answer
    x = 64,263.53

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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.