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Finding the Fourth Proportional to 971.12, 1,341.28 and 877.84

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Solution

The fourth proportional to 971.12, 1,341.28 and 877.84 is: 1,212.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.12 : 1,341.28 = 877.84 : x
  2. Step 2: Convert to fraction form
    971.12/1,341.28 = 877.84/x
  3. Step 3: Cross multiply
    971.12x = 1,341.28 × 877.84
  4. Step 4: Simplify right side
    971.12x = 1,177,429.24
  5. Step 5: Solve for x
    x = 1,177,429.24/971.12
  6. Step 6: Final answer
    x = 1,212.44

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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.