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Finding the Fourth Proportional to 30,171.48, 45,488.70 and 28,138.68

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Solution

The fourth proportional to 30,171.48, 45,488.70 and 28,138.68 is: 42,423.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,171.48 : 45,488.70 = 28,138.68 : x
  2. Step 2: Convert to fraction form
    30,171.48/45,488.70 = 28,138.68/x
  3. Step 3: Cross multiply
    30,171.48x = 45,488.70 × 28,138.68
  4. Step 4: Simplify right side
    30,171.48x = 1,279,991,972.92
  5. Step 5: Solve for x
    x = 1,279,991,972.92/30,171.48
  6. Step 6: Final answer
    x = 42,423.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.