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Finding the Fourth Proportional to 971.57, 1,340.78 and 529.46

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Solution

The fourth proportional to 971.57, 1,340.78 and 529.46 is: 730.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.57 : 1,340.78 = 529.46 : x
  2. Step 2: Convert to fraction form
    971.57/1,340.78 = 529.46/x
  3. Step 3: Cross multiply
    971.57x = 1,340.78 × 529.46
  4. Step 4: Simplify right side
    971.57x = 709,885.06
  5. Step 5: Solve for x
    x = 709,885.06/971.57
  6. Step 6: Final answer
    x = 730.66

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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.