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Finding the Fourth Proportional to 810.76, 1,118.85 and 575.11

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Solution

The fourth proportional to 810.76, 1,118.85 and 575.11 is: 793.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.76 : 1,118.85 = 575.11 : x
  2. Step 2: Convert to fraction form
    810.76/1,118.85 = 575.11/x
  3. Step 3: Cross multiply
    810.76x = 1,118.85 × 575.11
  4. Step 4: Simplify right side
    810.76x = 643,461.82
  5. Step 5: Solve for x
    x = 643,461.82/810.76
  6. Step 6: Final answer
    x = 793.65

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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.