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Finding the Fourth Proportional to 970.86, 1,456.92 and 393.78

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Solution

The fourth proportional to 970.86, 1,456.92 and 393.78 is: 590.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.86 : 1,456.92 = 393.78 : x
  2. Step 2: Convert to fraction form
    970.86/1,456.92 = 393.78/x
  3. Step 3: Cross multiply
    970.86x = 1,456.92 × 393.78
  4. Step 4: Simplify right side
    970.86x = 573,705.96
  5. Step 5: Solve for x
    x = 573,705.96/970.86
  6. Step 6: Final answer
    x = 590.93

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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.