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Finding the Fourth Proportional to 261,803.95, 392,655.80 and 72,217.17

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Solution

The fourth proportional to 261,803.95, 392,655.80 and 72,217.17 is: 108,311.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,803.95 : 392,655.80 = 72,217.17 : x
  2. Step 2: Convert to fraction form
    261,803.95/392,655.80 = 72,217.17/x
  3. Step 3: Cross multiply
    261,803.95x = 392,655.80 × 72,217.17
  4. Step 4: Simplify right side
    261,803.95x = 28,356,490,840.63
  5. Step 5: Solve for x
    x = 28,356,490,840.63/261,803.95
  6. Step 6: Final answer
    x = 108,311.93

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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.