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Finding the Fourth Proportional to 704.30, 1,047.50 and 689.72

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Solution

The fourth proportional to 704.30, 1,047.50 and 689.72 is: 1,025.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.30 : 1,047.50 = 689.72 : x
  2. Step 2: Convert to fraction form
    704.30/1,047.50 = 689.72/x
  3. Step 3: Cross multiply
    704.30x = 1,047.50 × 689.72
  4. Step 4: Simplify right side
    704.30x = 722,475.60
  5. Step 5: Solve for x
    x = 722,475.60/704.30
  6. Step 6: Final answer
    x = 1,025.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.