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Finding the Fourth Proportional to 897.12, 1,336.86 and 867.76

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Solution

The fourth proportional to 897.12, 1,336.86 and 867.76 is: 1,293.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.12 : 1,336.86 = 867.76 : x
  2. Step 2: Convert to fraction form
    897.12/1,336.86 = 867.76/x
  3. Step 3: Cross multiply
    897.12x = 1,336.86 × 867.76
  4. Step 4: Simplify right side
    897.12x = 1,160,073.63
  5. Step 5: Solve for x
    x = 1,160,073.63/897.12
  6. Step 6: Final answer
    x = 1,293.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.