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Finding the Fourth Proportional to 1,128.55, 1,557.42 and 631.13

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Solution

The fourth proportional to 1,128.55, 1,557.42 and 631.13 is: 870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.55 : 1,557.42 = 631.13 : x
  2. Step 2: Convert to fraction form
    1,128.55/1,557.42 = 631.13/x
  3. Step 3: Cross multiply
    1,128.55x = 1,557.42 × 631.13
  4. Step 4: Simplify right side
    1,128.55x = 982,931.33
  5. Step 5: Solve for x
    x = 982,931.33/1,128.55
  6. Step 6: Final answer
    x = 870.97

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1.5x scale

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.