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Finding the Fourth Proportional to 926.66, 1,390.34 and 561.71

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Solution

The fourth proportional to 926.66, 1,390.34 and 561.71 is: 842.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.66 : 1,390.34 = 561.71 : x
  2. Step 2: Convert to fraction form
    926.66/1,390.34 = 561.71/x
  3. Step 3: Cross multiply
    926.66x = 1,390.34 × 561.71
  4. Step 4: Simplify right side
    926.66x = 780,962.33
  5. Step 5: Solve for x
    x = 780,962.33/926.66
  6. Step 6: Final answer
    x = 842.78

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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.