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Finding the Fourth Proportional to 901.53, 1,244.49 and 621.66

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Solution

The fourth proportional to 901.53, 1,244.49 and 621.66 is: 858.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.53 : 1,244.49 = 621.66 : x
  2. Step 2: Convert to fraction form
    901.53/1,244.49 = 621.66/x
  3. Step 3: Cross multiply
    901.53x = 1,244.49 × 621.66
  4. Step 4: Simplify right side
    901.53x = 773,649.65
  5. Step 5: Solve for x
    x = 773,649.65/901.53
  6. Step 6: Final answer
    x = 858.15

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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.