Home / 1,128.38-1,557.18-630.99

Finding the Fourth Proportional to 1,128.38, 1,557.18 and 630.99

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Solution

The fourth proportional to 1,128.38, 1,557.18 and 630.99 is: 870.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.38 : 1,557.18 = 630.99 : x
  2. Step 2: Convert to fraction form
    1,128.38/1,557.18 = 630.99/x
  3. Step 3: Cross multiply
    1,128.38x = 1,557.18 × 630.99
  4. Step 4: Simplify right side
    1,128.38x = 982,565.01
  5. Step 5: Solve for x
    x = 982,565.01/1,128.38
  6. Step 6: Final answer
    x = 870.78

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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.