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Finding the Fourth Proportional to 1,040.46, 1,557 and 765.90

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Solution

The fourth proportional to 1,040.46, 1,557 and 765.90 is: 1,146.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.46 : 1,557 = 765.90 : x
  2. Step 2: Convert to fraction form
    1,040.46/1,557 = 765.90/x
  3. Step 3: Cross multiply
    1,040.46x = 1,557 × 765.90
  4. Step 4: Simplify right side
    1,040.46x = 1,192,506.30
  5. Step 5: Solve for x
    x = 1,192,506.30/1,040.46
  6. Step 6: Final answer
    x = 1,146.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.