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Finding the Fourth Proportional to 1,129.66, 1,558.92 and 910.18

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Solution

The fourth proportional to 1,129.66, 1,558.92 and 910.18 is: 1,256.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.66 : 1,558.92 = 910.18 : x
  2. Step 2: Convert to fraction form
    1,129.66/1,558.92 = 910.18/x
  3. Step 3: Cross multiply
    1,129.66x = 1,558.92 × 910.18
  4. Step 4: Simplify right side
    1,129.66x = 1,418,897.81
  5. Step 5: Solve for x
    x = 1,418,897.81/1,129.66
  6. Step 6: Final answer
    x = 1,256.04

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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.