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Finding the Fourth Proportional to 1,117.89, 1,676.66 and 424.53

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Solution

The fourth proportional to 1,117.89, 1,676.66 and 424.53 is: 636.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.89 : 1,676.66 = 424.53 : x
  2. Step 2: Convert to fraction form
    1,117.89/1,676.66 = 424.53/x
  3. Step 3: Cross multiply
    1,117.89x = 1,676.66 × 424.53
  4. Step 4: Simplify right side
    1,117.89x = 711,790.35
  5. Step 5: Solve for x
    x = 711,790.35/1,117.89
  6. Step 6: Final answer
    x = 636.73

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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.