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Finding the Fourth Proportional to 15,782.88, 21,781.08 and 9,070.68

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Solution

The fourth proportional to 15,782.88, 21,781.08 and 9,070.68 is: 12,517.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,782.88 : 21,781.08 = 9,070.68 : x
  2. Step 2: Convert to fraction form
    15,782.88/21,781.08 = 9,070.68/x
  3. Step 3: Cross multiply
    15,782.88x = 21,781.08 × 9,070.68
  4. Step 4: Simplify right side
    15,782.88x = 197,569,206.73
  5. Step 5: Solve for x
    x = 197,569,206.73/15,782.88
  6. Step 6: Final answer
    x = 12,517.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.