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Finding the Fourth Proportional to 752.40, 1,035.36 and 665.28

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Solution

The fourth proportional to 752.40, 1,035.36 and 665.28 is: 915.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.40 : 1,035.36 = 665.28 : x
  2. Step 2: Convert to fraction form
    752.40/1,035.36 = 665.28/x
  3. Step 3: Cross multiply
    752.40x = 1,035.36 × 665.28
  4. Step 4: Simplify right side
    752.40x = 688,804.30
  5. Step 5: Solve for x
    x = 688,804.30/752.40
  6. Step 6: Final answer
    x = 915.48

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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.