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Finding the Fourth Proportional to 20,354.81, 28,089.22 and 11,280.10

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Solution

The fourth proportional to 20,354.81, 28,089.22 and 11,280.10 is: 15,566.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,354.81 : 28,089.22 = 11,280.10 : x
  2. Step 2: Convert to fraction form
    20,354.81/28,089.22 = 11,280.10/x
  3. Step 3: Cross multiply
    20,354.81x = 28,089.22 × 11,280.10
  4. Step 4: Simplify right side
    20,354.81x = 316,849,070.08
  5. Step 5: Solve for x
    x = 316,849,070.08/20,354.81
  6. Step 6: Final answer
    x = 15,566.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.