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Finding the Fourth Proportional to 15,392.80, 21,242.04 and 9,105.20

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Solution

The fourth proportional to 15,392.80, 21,242.04 and 9,105.20 is: 12,565.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,392.80 : 21,242.04 = 9,105.20 : x
  2. Step 2: Convert to fraction form
    15,392.80/21,242.04 = 9,105.20/x
  3. Step 3: Cross multiply
    15,392.80x = 21,242.04 × 9,105.20
  4. Step 4: Simplify right side
    15,392.80x = 193,413,022.61
  5. Step 5: Solve for x
    x = 193,413,022.61/15,392.80
  6. Step 6: Final answer
    x = 12,565.16

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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.