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Finding the Fourth Proportional to 1,127.13, 1,555.10 and 891.12

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Solution

The fourth proportional to 1,127.13, 1,555.10 and 891.12 is: 1,229.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.13 : 1,555.10 = 891.12 : x
  2. Step 2: Convert to fraction form
    1,127.13/1,555.10 = 891.12/x
  3. Step 3: Cross multiply
    1,127.13x = 1,555.10 × 891.12
  4. Step 4: Simplify right side
    1,127.13x = 1,385,776.26
  5. Step 5: Solve for x
    x = 1,385,776.26/1,127.13
  6. Step 6: Final answer
    x = 1,229.47

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Double scale
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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.