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Finding the Fourth Proportional to 15,888.92, 21,929.76 and 9,178.88

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Solution

The fourth proportional to 15,888.92, 21,929.76 and 9,178.88 is: 12,668.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,888.92 : 21,929.76 = 9,178.88 : x
  2. Step 2: Convert to fraction form
    15,888.92/21,929.76 = 9,178.88/x
  3. Step 3: Cross multiply
    15,888.92x = 21,929.76 × 9,178.88
  4. Step 4: Simplify right side
    15,888.92x = 201,290,635.47
  5. Step 5: Solve for x
    x = 201,290,635.47/15,888.92
  6. Step 6: Final answer
    x = 12,668.62

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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.