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Finding the Fourth Proportional to 28,171.47, 38,875.42 and 15,424.42

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Solution

The fourth proportional to 28,171.47, 38,875.42 and 15,424.42 is: 21,285.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,171.47 : 38,875.42 = 15,424.42 : x
  2. Step 2: Convert to fraction form
    28,171.47/38,875.42 = 15,424.42/x
  3. Step 3: Cross multiply
    28,171.47x = 38,875.42 × 15,424.42
  4. Step 4: Simplify right side
    28,171.47x = 599,630,756.77
  5. Step 5: Solve for x
    x = 599,630,756.77/28,171.47
  6. Step 6: Final answer
    x = 21,285.04

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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.