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Finding the Fourth Proportional to 1,157.42, 1,736.10 and 279.91

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Solution

The fourth proportional to 1,157.42, 1,736.10 and 279.91 is: 419.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.42 : 1,736.10 = 279.91 : x
  2. Step 2: Convert to fraction form
    1,157.42/1,736.10 = 279.91/x
  3. Step 3: Cross multiply
    1,157.42x = 1,736.10 × 279.91
  4. Step 4: Simplify right side
    1,157.42x = 485,948.46
  5. Step 5: Solve for x
    x = 485,948.46/1,157.42
  6. Step 6: Final answer
    x = 419.86

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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.