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Finding the Fourth Proportional to 971.90, 1,341.21 and 529.79

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Solution

The fourth proportional to 971.90, 1,341.21 and 529.79 is: 731.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.90 : 1,341.21 = 529.79 : x
  2. Step 2: Convert to fraction form
    971.90/1,341.21 = 529.79/x
  3. Step 3: Cross multiply
    971.90x = 1,341.21 × 529.79
  4. Step 4: Simplify right side
    971.90x = 710,559.65
  5. Step 5: Solve for x
    x = 710,559.65/971.90
  6. Step 6: Final answer
    x = 731.10

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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.