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Finding the Fourth Proportional to 810.38, 1,116.80 and 561.26

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Solution

The fourth proportional to 810.38, 1,116.80 and 561.26 is: 773.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.38 : 1,116.80 = 561.26 : x
  2. Step 2: Convert to fraction form
    810.38/1,116.80 = 561.26/x
  3. Step 3: Cross multiply
    810.38x = 1,116.80 × 561.26
  4. Step 4: Simplify right side
    810.38x = 626,809.58
  5. Step 5: Solve for x
    x = 626,809.58/810.38
  6. Step 6: Final answer
    x = 773.48

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Half scale
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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.