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Finding the Fourth Proportional to 810.46, 1,117.24 and 561.68

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Solution

The fourth proportional to 810.46, 1,117.24 and 561.68 is: 774.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.46 : 1,117.24 = 561.68 : x
  2. Step 2: Convert to fraction form
    810.46/1,117.24 = 561.68/x
  3. Step 3: Cross multiply
    810.46x = 1,117.24 × 561.68
  4. Step 4: Simplify right side
    810.46x = 627,531.36
  5. Step 5: Solve for x
    x = 627,531.36/810.46
  6. Step 6: Final answer
    x = 774.29

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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.