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Finding the Fourth Proportional to 971.04, 1,340.16 and 557.12

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Solution

The fourth proportional to 971.04, 1,340.16 and 557.12 is: 768.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.04 : 1,340.16 = 557.12 : x
  2. Step 2: Convert to fraction form
    971.04/1,340.16 = 557.12/x
  3. Step 3: Cross multiply
    971.04x = 1,340.16 × 557.12
  4. Step 4: Simplify right side
    971.04x = 746,629.94
  5. Step 5: Solve for x
    x = 746,629.94/971.04
  6. Step 6: Final answer
    x = 768.90

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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.