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Finding the Fourth Proportional to 28,099.71, 42,149.57 and 9,128.17

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Solution

The fourth proportional to 28,099.71, 42,149.57 and 9,128.17 is: 13,692.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,099.71 : 42,149.57 = 9,128.17 : x
  2. Step 2: Convert to fraction form
    28,099.71/42,149.57 = 9,128.17/x
  3. Step 3: Cross multiply
    28,099.71x = 42,149.57 × 9,128.17
  4. Step 4: Simplify right side
    28,099.71x = 384,748,328.89
  5. Step 5: Solve for x
    x = 384,748,328.89/28,099.71
  6. Step 6: Final answer
    x = 13,692.25

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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.