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Finding the Fourth Proportional to 15,357, 21,191.58 and 9,390.36

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Solution

The fourth proportional to 15,357, 21,191.58 and 9,390.36 is: 12,958.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,357 : 21,191.58 = 9,390.36 : x
  2. Step 2: Convert to fraction form
    15,357/21,191.58 = 9,390.36/x
  3. Step 3: Cross multiply
    15,357x = 21,191.58 × 9,390.36
  4. Step 4: Simplify right side
    15,357x = 198,996,565.17
  5. Step 5: Solve for x
    x = 198,996,565.17/15,357
  6. Step 6: Final answer
    x = 12,958.04

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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.