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Finding the Fourth Proportional to 1,158.61, 1,598.87 and 661.22

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Solution

The fourth proportional to 1,158.61, 1,598.87 and 661.22 is: 912.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.61 : 1,598.87 = 661.22 : x
  2. Step 2: Convert to fraction form
    1,158.61/1,598.87 = 661.22/x
  3. Step 3: Cross multiply
    1,158.61x = 1,598.87 × 661.22
  4. Step 4: Simplify right side
    1,158.61x = 1,057,198.48
  5. Step 5: Solve for x
    x = 1,057,198.48/1,158.61
  6. Step 6: Final answer
    x = 912.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.