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Finding the Fourth Proportional to 1,116.42, 1,674.90 and 458.28

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Solution

The fourth proportional to 1,116.42, 1,674.90 and 458.28 is: 687.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.42 : 1,674.90 = 458.28 : x
  2. Step 2: Convert to fraction form
    1,116.42/1,674.90 = 458.28/x
  3. Step 3: Cross multiply
    1,116.42x = 1,674.90 × 458.28
  4. Step 4: Simplify right side
    1,116.42x = 767,573.17
  5. Step 5: Solve for x
    x = 767,573.17/1,116.42
  6. Step 6: Final answer
    x = 687.53

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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.