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Finding the Fourth Proportional to 1,565.84, 2,160.80 and 867.20

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Solution

The fourth proportional to 1,565.84, 2,160.80 and 867.20 is: 1,196.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.84 : 2,160.80 = 867.20 : x
  2. Step 2: Convert to fraction form
    1,565.84/2,160.80 = 867.20/x
  3. Step 3: Cross multiply
    1,565.84x = 2,160.80 × 867.20
  4. Step 4: Simplify right side
    1,565.84x = 1,873,845.76
  5. Step 5: Solve for x
    x = 1,873,845.76/1,565.84
  6. Step 6: Final answer
    x = 1,196.70

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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.