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Finding the Fourth Proportional to 917.16, 1,271.40 and 886.92

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Solution

The fourth proportional to 917.16, 1,271.40 and 886.92 is: 1,229.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.16 : 1,271.40 = 886.92 : x
  2. Step 2: Convert to fraction form
    917.16/1,271.40 = 886.92/x
  3. Step 3: Cross multiply
    917.16x = 1,271.40 × 886.92
  4. Step 4: Simplify right side
    917.16x = 1,127,630.09
  5. Step 5: Solve for x
    x = 1,127,630.09/917.16
  6. Step 6: Final answer
    x = 1,229.48

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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.