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Finding the Fourth Proportional to 865.83, 1,295.99 and 621.17

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Solution

The fourth proportional to 865.83, 1,295.99 and 621.17 is: 929.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.83 : 1,295.99 = 621.17 : x
  2. Step 2: Convert to fraction form
    865.83/1,295.99 = 621.17/x
  3. Step 3: Cross multiply
    865.83x = 1,295.99 × 621.17
  4. Step 4: Simplify right side
    865.83x = 805,030.11
  5. Step 5: Solve for x
    x = 805,030.11/865.83
  6. Step 6: Final answer
    x = 929.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.