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Finding the Fourth Proportional to 1,087.29, 1,500.48 and 621.54

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Solution

The fourth proportional to 1,087.29, 1,500.48 and 621.54 is: 857.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.29 : 1,500.48 = 621.54 : x
  2. Step 2: Convert to fraction form
    1,087.29/1,500.48 = 621.54/x
  3. Step 3: Cross multiply
    1,087.29x = 1,500.48 × 621.54
  4. Step 4: Simplify right side
    1,087.29x = 932,608.34
  5. Step 5: Solve for x
    x = 932,608.34/1,087.29
  6. Step 6: Final answer
    x = 857.74

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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.