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Finding the Fourth Proportional to 1,158.71, 1,599.20 and 661.51

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Solution

The fourth proportional to 1,158.71, 1,599.20 and 661.51 is: 912.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.71 : 1,599.20 = 661.51 : x
  2. Step 2: Convert to fraction form
    1,158.71/1,599.20 = 661.51/x
  3. Step 3: Cross multiply
    1,158.71x = 1,599.20 × 661.51
  4. Step 4: Simplify right side
    1,158.71x = 1,057,875.49
  5. Step 5: Solve for x
    x = 1,057,875.49/1,158.71
  6. Step 6: Final answer
    x = 912.98

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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.