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Finding the Fourth Proportional to 21,000.55, 31,489.88 and 9,904.25

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Solution

The fourth proportional to 21,000.55, 31,489.88 and 9,904.25 is: 14,851.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.55 : 31,489.88 = 9,904.25 : x
  2. Step 2: Convert to fraction form
    21,000.55/31,489.88 = 9,904.25/x
  3. Step 3: Cross multiply
    21,000.55x = 31,489.88 × 9,904.25
  4. Step 4: Simplify right side
    21,000.55x = 311,883,747.48
  5. Step 5: Solve for x
    x = 311,883,747.48/21,000.55
  6. Step 6: Final answer
    x = 14,851.22

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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.