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Finding the Fourth Proportional to 810.33, 1,113.41 and 644.26

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Solution

The fourth proportional to 810.33, 1,113.41 and 644.26 is: 885.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.33 : 1,113.41 = 644.26 : x
  2. Step 2: Convert to fraction form
    810.33/1,113.41 = 644.26/x
  3. Step 3: Cross multiply
    810.33x = 1,113.41 × 644.26
  4. Step 4: Simplify right side
    810.33x = 717,316.74
  5. Step 5: Solve for x
    x = 717,316.74/810.33
  6. Step 6: Final answer
    x = 885.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.