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Finding the Fourth Proportional to 21,000.59, 31,489.95 and 9,904.30

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Solution

The fourth proportional to 21,000.59, 31,489.95 and 9,904.30 is: 14,851.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.59 : 31,489.95 = 9,904.30 : x
  2. Step 2: Convert to fraction form
    21,000.59/31,489.95 = 9,904.30/x
  3. Step 3: Cross multiply
    21,000.59x = 31,489.95 × 9,904.30
  4. Step 4: Simplify right side
    21,000.59x = 311,885,911.79
  5. Step 5: Solve for x
    x = 311,885,911.79/21,000.59
  6. Step 6: Final answer
    x = 14,851.29

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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.