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Finding the Fourth Proportional to 1,130.88, 1,689.83 and 862.25

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Solution

The fourth proportional to 1,130.88, 1,689.83 and 862.25 is: 1,288.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.88 : 1,689.83 = 862.25 : x
  2. Step 2: Convert to fraction form
    1,130.88/1,689.83 = 862.25/x
  3. Step 3: Cross multiply
    1,130.88x = 1,689.83 × 862.25
  4. Step 4: Simplify right side
    1,130.88x = 1,457,062.30
  5. Step 5: Solve for x
    x = 1,457,062.30/1,130.88
  6. Step 6: Final answer
    x = 1,288.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.