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Finding the Fourth Proportional to 261,808.66, 392,705.16 and 72,280.60

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Solution

The fourth proportional to 261,808.66, 392,705.16 and 72,280.60 is: 108,418.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,808.66 : 392,705.16 = 72,280.60 : x
  2. Step 2: Convert to fraction form
    261,808.66/392,705.16 = 72,280.60/x
  3. Step 3: Cross multiply
    261,808.66x = 392,705.16 × 72,280.60
  4. Step 4: Simplify right side
    261,808.66x = 28,384,965,950.63
  5. Step 5: Solve for x
    x = 28,384,965,950.63/261,808.66
  6. Step 6: Final answer
    x = 108,418.75

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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.