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Finding the Fourth Proportional to 752.66, 1,038.20 and 487.00

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Solution

The fourth proportional to 752.66, 1,038.20 and 487.00 is: 671.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.66 : 1,038.20 = 487.00 : x
  2. Step 2: Convert to fraction form
    752.66/1,038.20 = 487.00/x
  3. Step 3: Cross multiply
    752.66x = 1,038.20 × 487.00
  4. Step 4: Simplify right side
    752.66x = 505,599.16
  5. Step 5: Solve for x
    x = 505,599.16/752.66
  6. Step 6: Final answer
    x = 671.75

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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.