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Finding the Fourth Proportional to 810.21, 1,115.18 and 717.33

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Solution

The fourth proportional to 810.21, 1,115.18 and 717.33 is: 987.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.21 : 1,115.18 = 717.33 : x
  2. Step 2: Convert to fraction form
    810.21/1,115.18 = 717.33/x
  3. Step 3: Cross multiply
    810.21x = 1,115.18 × 717.33
  4. Step 4: Simplify right side
    810.21x = 799,959.39
  5. Step 5: Solve for x
    x = 799,959.39/810.21
  6. Step 6: Final answer
    x = 987.34

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Double scale
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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.