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Finding the Fourth Proportional to 1,087.32, 1,501.02 and 621.48

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Solution

The fourth proportional to 1,087.32, 1,501.02 and 621.48 is: 857.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.32 : 1,501.02 = 621.48 : x
  2. Step 2: Convert to fraction form
    1,087.32/1,501.02 = 621.48/x
  3. Step 3: Cross multiply
    1,087.32x = 1,501.02 × 621.48
  4. Step 4: Simplify right side
    1,087.32x = 932,853.91
  5. Step 5: Solve for x
    x = 932,853.91/1,087.32
  6. Step 6: Final answer
    x = 857.94

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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.