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Finding the Fourth Proportional to 765.74, 1,153.14 and 689.60

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Solution

The fourth proportional to 765.74, 1,153.14 and 689.60 is: 1,038.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.74 : 1,153.14 = 689.60 : x
  2. Step 2: Convert to fraction form
    765.74/1,153.14 = 689.60/x
  3. Step 3: Cross multiply
    765.74x = 1,153.14 × 689.60
  4. Step 4: Simplify right side
    765.74x = 795,205.34
  5. Step 5: Solve for x
    x = 795,205.34/765.74
  6. Step 6: Final answer
    x = 1,038.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.