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Finding the Fourth Proportional to 971.79, 1,340.84 and 552.05

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Solution

The fourth proportional to 971.79, 1,340.84 and 552.05 is: 761.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.79 : 1,340.84 = 552.05 : x
  2. Step 2: Convert to fraction form
    971.79/1,340.84 = 552.05/x
  3. Step 3: Cross multiply
    971.79x = 1,340.84 × 552.05
  4. Step 4: Simplify right side
    971.79x = 740,201.26
  5. Step 5: Solve for x
    x = 740,201.26/971.79
  6. Step 6: Final answer
    x = 761.69

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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.