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Finding the Fourth Proportional to 1,125.47, 1,553.20 and 621.32

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Solution

The fourth proportional to 1,125.47, 1,553.20 and 621.32 is: 857.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.47 : 1,553.20 = 621.32 : x
  2. Step 2: Convert to fraction form
    1,125.47/1,553.20 = 621.32/x
  3. Step 3: Cross multiply
    1,125.47x = 1,553.20 × 621.32
  4. Step 4: Simplify right side
    1,125.47x = 965,034.22
  5. Step 5: Solve for x
    x = 965,034.22/1,125.47
  6. Step 6: Final answer
    x = 857.45

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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.