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Finding the Fourth Proportional to 261,813.06, 392,728.12 and 72,287.64

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Solution

The fourth proportional to 261,813.06, 392,728.12 and 72,287.64 is: 108,433.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,813.06 : 392,728.12 = 72,287.64 : x
  2. Step 2: Convert to fraction form
    261,813.06/392,728.12 = 72,287.64/x
  3. Step 3: Cross multiply
    261,813.06x = 392,728.12 × 72,287.64
  4. Step 4: Simplify right side
    261,813.06x = 28,389,388,956.44
  5. Step 5: Solve for x
    x = 28,389,388,956.44/261,813.06
  6. Step 6: Final answer
    x = 108,433.82

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1.5x scale

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.