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Finding the Fourth Proportional to 810.08, 1,120.20 and 613.52

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Solution

The fourth proportional to 810.08, 1,120.20 and 613.52 is: 848.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.08 : 1,120.20 = 613.52 : x
  2. Step 2: Convert to fraction form
    810.08/1,120.20 = 613.52/x
  3. Step 3: Cross multiply
    810.08x = 1,120.20 × 613.52
  4. Step 4: Simplify right side
    810.08x = 687,265.10
  5. Step 5: Solve for x
    x = 687,265.10/810.08
  6. Step 6: Final answer
    x = 848.39

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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.