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Finding the Fourth Proportional to 1,128.46, 1,557.06 and 631.03

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Solution

The fourth proportional to 1,128.46, 1,557.06 and 631.03 is: 870.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.46 : 1,557.06 = 631.03 : x
  2. Step 2: Convert to fraction form
    1,128.46/1,557.06 = 631.03/x
  3. Step 3: Cross multiply
    1,128.46x = 1,557.06 × 631.03
  4. Step 4: Simplify right side
    1,128.46x = 982,551.57
  5. Step 5: Solve for x
    x = 982,551.57/1,128.46
  6. Step 6: Final answer
    x = 870.70

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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.