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Finding the Fourth Proportional to 880.32, 1,220.37 and 865.20

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Solution

The fourth proportional to 880.32, 1,220.37 and 865.20 is: 1,199.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.32 : 1,220.37 = 865.20 : x
  2. Step 2: Convert to fraction form
    880.32/1,220.37 = 865.20/x
  3. Step 3: Cross multiply
    880.32x = 1,220.37 × 865.20
  4. Step 4: Simplify right side
    880.32x = 1,055,864.12
  5. Step 5: Solve for x
    x = 1,055,864.12/880.32
  6. Step 6: Final answer
    x = 1,199.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.