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Finding the Fourth Proportional to 810.25, 1,118.32 and 515.45

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Solution

The fourth proportional to 810.25, 1,118.32 and 515.45 is: 711.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.25 : 1,118.32 = 515.45 : x
  2. Step 2: Convert to fraction form
    810.25/1,118.32 = 515.45/x
  3. Step 3: Cross multiply
    810.25x = 1,118.32 × 515.45
  4. Step 4: Simplify right side
    810.25x = 576,439.55
  5. Step 5: Solve for x
    x = 576,439.55/810.25
  6. Step 6: Final answer
    x = 711.44

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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.