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Finding the Fourth Proportional to 749.60, 1,122.36 and 505.64

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Solution

The fourth proportional to 749.60, 1,122.36 and 505.64 is: 757.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.60 : 1,122.36 = 505.64 : x
  2. Step 2: Convert to fraction form
    749.60/1,122.36 = 505.64/x
  3. Step 3: Cross multiply
    749.60x = 1,122.36 × 505.64
  4. Step 4: Simplify right side
    749.60x = 567,511.02
  5. Step 5: Solve for x
    x = 567,511.02/749.60
  6. Step 6: Final answer
    x = 757.08

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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.