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Finding the Fourth Proportional to 810.52, 1,118.60 and 515.80

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Solution

The fourth proportional to 810.52, 1,118.60 and 515.80 is: 711.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.52 : 1,118.60 = 515.80 : x
  2. Step 2: Convert to fraction form
    810.52/1,118.60 = 515.80/x
  3. Step 3: Cross multiply
    810.52x = 1,118.60 × 515.80
  4. Step 4: Simplify right side
    810.52x = 576,973.88
  5. Step 5: Solve for x
    x = 576,973.88/810.52
  6. Step 6: Final answer
    x = 711.86

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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.