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Finding the Fourth Proportional to 261,816.95, 392,717.57 and 72,288.89

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Solution

The fourth proportional to 261,816.95, 392,717.57 and 72,288.89 is: 108,431.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,816.95 : 392,717.57 = 72,288.89 : x
  2. Step 2: Convert to fraction form
    261,816.95/392,717.57 = 72,288.89/x
  3. Step 3: Cross multiply
    261,816.95x = 392,717.57 × 72,288.89
  4. Step 4: Simplify right side
    261,816.95x = 28,389,116,857.35
  5. Step 5: Solve for x
    x = 28,389,116,857.35/261,816.95
  6. Step 6: Final answer
    x = 108,431.17

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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.