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Finding the Fourth Proportional to 971.21, 1,340.26 and 529.13

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Solution

The fourth proportional to 971.21, 1,340.26 and 529.13 is: 730.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.21 : 1,340.26 = 529.13 : x
  2. Step 2: Convert to fraction form
    971.21/1,340.26 = 529.13/x
  3. Step 3: Cross multiply
    971.21x = 1,340.26 × 529.13
  4. Step 4: Simplify right side
    971.21x = 709,173.80
  5. Step 5: Solve for x
    x = 709,173.80/971.21
  6. Step 6: Final answer
    x = 730.19

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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.