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Finding the Fourth Proportional to 749.60, 1,124.64 and 613.28

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Solution

The fourth proportional to 749.60, 1,124.64 and 613.28 is: 920.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.60 : 1,124.64 = 613.28 : x
  2. Step 2: Convert to fraction form
    749.60/1,124.64 = 613.28/x
  3. Step 3: Cross multiply
    749.60x = 1,124.64 × 613.28
  4. Step 4: Simplify right side
    749.60x = 689,719.22
  5. Step 5: Solve for x
    x = 689,719.22/749.60
  6. Step 6: Final answer
    x = 920.12

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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.