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Finding the Fourth Proportional to 1,158.66, 1,736.64 and 912.15

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Solution

The fourth proportional to 1,158.66, 1,736.64 and 912.15 is: 1,367.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.66 : 1,736.64 = 912.15 : x
  2. Step 2: Convert to fraction form
    1,158.66/1,736.64 = 912.15/x
  3. Step 3: Cross multiply
    1,158.66x = 1,736.64 × 912.15
  4. Step 4: Simplify right side
    1,158.66x = 1,584,076.18
  5. Step 5: Solve for x
    x = 1,584,076.18/1,158.66
  6. Step 6: Final answer
    x = 1,367.16

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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.