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Finding the Fourth Proportional to 72,705.19, 100,332.16 and 40,439.50

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Solution

The fourth proportional to 72,705.19, 100,332.16 and 40,439.50 is: 55,805.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,705.19 : 100,332.16 = 40,439.50 : x
  2. Step 2: Convert to fraction form
    72,705.19/100,332.16 = 40,439.50/x
  3. Step 3: Cross multiply
    72,705.19x = 100,332.16 × 40,439.50
  4. Step 4: Simplify right side
    72,705.19x = 4,057,382,384.32
  5. Step 5: Solve for x
    x = 4,057,382,384.32/72,705.19
  6. Step 6: Final answer
    x = 55,805.95

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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.