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Finding the Fourth Proportional to 926.50, 1,390.67 and 406.86

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Solution

The fourth proportional to 926.50, 1,390.67 and 406.86 is: 610.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.50 : 1,390.67 = 406.86 : x
  2. Step 2: Convert to fraction form
    926.50/1,390.67 = 406.86/x
  3. Step 3: Cross multiply
    926.50x = 1,390.67 × 406.86
  4. Step 4: Simplify right side
    926.50x = 565,805.96
  5. Step 5: Solve for x
    x = 565,805.96/926.50
  6. Step 6: Final answer
    x = 610.69

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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.