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Finding the Fourth Proportional to 1,158.66, 1,738.50 and 638.64

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Solution

The fourth proportional to 1,158.66, 1,738.50 and 638.64 is: 958.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.66 : 1,738.50 = 638.64 : x
  2. Step 2: Convert to fraction form
    1,158.66/1,738.50 = 638.64/x
  3. Step 3: Cross multiply
    1,158.66x = 1,738.50 × 638.64
  4. Step 4: Simplify right side
    1,158.66x = 1,110,275.64
  5. Step 5: Solve for x
    x = 1,110,275.64/1,158.66
  6. Step 6: Final answer
    x = 958.24

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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.