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Finding the Fourth Proportional to 261,672.61, 392,587.71 and 81,750.77

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Solution

The fourth proportional to 261,672.61, 392,587.71 and 81,750.77 is: 122,650.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,672.61 : 392,587.71 = 81,750.77 : x
  2. Step 2: Convert to fraction form
    261,672.61/392,587.71 = 81,750.77/x
  3. Step 3: Cross multiply
    261,672.61x = 392,587.71 × 81,750.77
  4. Step 4: Simplify right side
    261,672.61x = 32,094,345,622.10
  5. Step 5: Solve for x
    x = 32,094,345,622.10/261,672.61
  6. Step 6: Final answer
    x = 122,650.77

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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.