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Finding the Fourth Proportional to 1,478.57, 2,217.36 and 747.68

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Solution

The fourth proportional to 1,478.57, 2,217.36 and 747.68 is: 1,121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,478.57 : 2,217.36 = 747.68 : x
  2. Step 2: Convert to fraction form
    1,478.57/2,217.36 = 747.68/x
  3. Step 3: Cross multiply
    1,478.57x = 2,217.36 × 747.68
  4. Step 4: Simplify right side
    1,478.57x = 1,657,875.72
  5. Step 5: Solve for x
    x = 1,657,875.72/1,478.57
  6. Step 6: Final answer
    x = 1,121.27

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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.