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Finding the Fourth Proportional to 801.74, 1,105.66 and 644.06

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Solution

The fourth proportional to 801.74, 1,105.66 and 644.06 is: 888.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.74 : 1,105.66 = 644.06 : x
  2. Step 2: Convert to fraction form
    801.74/1,105.66 = 644.06/x
  3. Step 3: Cross multiply
    801.74x = 1,105.66 × 644.06
  4. Step 4: Simplify right side
    801.74x = 712,111.38
  5. Step 5: Solve for x
    x = 712,111.38/801.74
  6. Step 6: Final answer
    x = 888.21

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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.