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Finding the Fourth Proportional to 971.04, 1,456.68 and 393.78

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Solution

The fourth proportional to 971.04, 1,456.68 and 393.78 is: 590.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.04 : 1,456.68 = 393.78 : x
  2. Step 2: Convert to fraction form
    971.04/1,456.68 = 393.78/x
  3. Step 3: Cross multiply
    971.04x = 1,456.68 × 393.78
  4. Step 4: Simplify right side
    971.04x = 573,611.45
  5. Step 5: Solve for x
    x = 573,611.45/971.04
  6. Step 6: Final answer
    x = 590.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.