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Finding the Fourth Proportional to 810.32, 1,118.28 and 515.66

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Solution

The fourth proportional to 810.32, 1,118.28 and 515.66 is: 711.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.32 : 1,118.28 = 515.66 : x
  2. Step 2: Convert to fraction form
    810.32/1,118.28 = 515.66/x
  3. Step 3: Cross multiply
    810.32x = 1,118.28 × 515.66
  4. Step 4: Simplify right side
    810.32x = 576,652.26
  5. Step 5: Solve for x
    x = 576,652.26/810.32
  6. Step 6: Final answer
    x = 711.64

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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.