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Finding the Fourth Proportional to 261,521.70, 392,282.55 and 71,981.70

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Solution

The fourth proportional to 261,521.70, 392,282.55 and 71,981.70 is: 107,972.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,521.70 : 392,282.55 = 71,981.70 : x
  2. Step 2: Convert to fraction form
    261,521.70/392,282.55 = 71,981.70/x
  3. Step 3: Cross multiply
    261,521.70x = 392,282.55 × 71,981.70
  4. Step 4: Simplify right side
    261,521.70x = 28,237,164,829.34
  5. Step 5: Solve for x
    x = 28,237,164,829.34/261,521.70
  6. Step 6: Final answer
    x = 107,972.55

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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.