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Finding the Fourth Proportional to 742.18, 1,113.51 and 677.86

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Solution

The fourth proportional to 742.18, 1,113.51 and 677.86 is: 1,017.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.18 : 1,113.51 = 677.86 : x
  2. Step 2: Convert to fraction form
    742.18/1,113.51 = 677.86/x
  3. Step 3: Cross multiply
    742.18x = 1,113.51 × 677.86
  4. Step 4: Simplify right side
    742.18x = 754,803.89
  5. Step 5: Solve for x
    x = 754,803.89/742.18
  6. Step 6: Final answer
    x = 1,017.01

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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.