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Finding the Fourth Proportional to 917.20, 1,265.36 and 740.64

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Solution

The fourth proportional to 917.20, 1,265.36 and 740.64 is: 1,021.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.20 : 1,265.36 = 740.64 : x
  2. Step 2: Convert to fraction form
    917.20/1,265.36 = 740.64/x
  3. Step 3: Cross multiply
    917.20x = 1,265.36 × 740.64
  4. Step 4: Simplify right side
    917.20x = 937,176.23
  5. Step 5: Solve for x
    x = 937,176.23/917.20
  6. Step 6: Final answer
    x = 1,021.78

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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.