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Finding the Fourth Proportional to 18,699.50, 28,053.72 and 6,387.50

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Solution

The fourth proportional to 18,699.50, 28,053.72 and 6,387.50 is: 9,582.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,699.50 : 28,053.72 = 6,387.50 : x
  2. Step 2: Convert to fraction form
    18,699.50/28,053.72 = 6,387.50/x
  3. Step 3: Cross multiply
    18,699.50x = 28,053.72 × 6,387.50
  4. Step 4: Simplify right side
    18,699.50x = 179,193,136.50
  5. Step 5: Solve for x
    x = 179,193,136.50/18,699.50
  6. Step 6: Final answer
    x = 9,582.78

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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.