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Finding the Fourth Proportional to 19,239.40, 28,859.10 and 18,000.10

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Solution

The fourth proportional to 19,239.40, 28,859.10 and 18,000.10 is: 27,000.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,239.40 : 28,859.10 = 18,000.10 : x
  2. Step 2: Convert to fraction form
    19,239.40/28,859.10 = 18,000.10/x
  3. Step 3: Cross multiply
    19,239.40x = 28,859.10 × 18,000.10
  4. Step 4: Simplify right side
    19,239.40x = 519,466,685.91
  5. Step 5: Solve for x
    x = 519,466,685.91/19,239.40
  6. Step 6: Final answer
    x = 27,000.15

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Similar ratio
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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.