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Finding the Fourth Proportional to 21,337.68, 31,987.16 and 7,479.12

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Solution

The fourth proportional to 21,337.68, 31,987.16 and 7,479.12 is: 11,211.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,337.68 : 31,987.16 = 7,479.12 : x
  2. Step 2: Convert to fraction form
    21,337.68/31,987.16 = 7,479.12/x
  3. Step 3: Cross multiply
    21,337.68x = 31,987.16 × 7,479.12
  4. Step 4: Simplify right side
    21,337.68x = 239,235,808.10
  5. Step 5: Solve for x
    x = 239,235,808.10/21,337.68
  6. Step 6: Final answer
    x = 11,211.89

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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.