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Finding the Fourth Proportional to 261,990.90, 392,403.15 and 256,158.90

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Solution

The fourth proportional to 261,990.90, 392,403.15 and 256,158.90 is: 383,668.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,990.90 : 392,403.15 = 256,158.90 : x
  2. Step 2: Convert to fraction form
    261,990.90/392,403.15 = 256,158.90/x
  3. Step 3: Cross multiply
    261,990.90x = 392,403.15 × 256,158.90
  4. Step 4: Simplify right side
    261,990.90x = 100,517,559,260.54
  5. Step 5: Solve for x
    x = 100,517,559,260.54/261,990.90
  6. Step 6: Final answer
    x = 383,668.13

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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.