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Finding the Fourth Proportional to 72,981.19, 100,715.16 and 42,759.28

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Solution

The fourth proportional to 72,981.19, 100,715.16 and 42,759.28 is: 59,008.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,981.19 : 100,715.16 = 42,759.28 : x
  2. Step 2: Convert to fraction form
    72,981.19/100,715.16 = 42,759.28/x
  3. Step 3: Cross multiply
    72,981.19x = 100,715.16 × 42,759.28
  4. Step 4: Simplify right side
    72,981.19x = 4,306,507,726.68
  5. Step 5: Solve for x
    x = 4,306,507,726.68/72,981.19
  6. Step 6: Final answer
    x = 59,008.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.