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Finding the Fourth Proportional to 1,490.18, 2,233.91 and 760.28

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Solution

The fourth proportional to 1,490.18, 2,233.91 and 760.28 is: 1,139.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.18 : 2,233.91 = 760.28 : x
  2. Step 2: Convert to fraction form
    1,490.18/2,233.91 = 760.28/x
  3. Step 3: Cross multiply
    1,490.18x = 2,233.91 × 760.28
  4. Step 4: Simplify right side
    1,490.18x = 1,698,382.12
  5. Step 5: Solve for x
    x = 1,698,382.12/1,490.18
  6. Step 6: Final answer
    x = 1,139.72

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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.