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Finding the Fourth Proportional to 1,255.92, 1,881.96 and 561.84

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Solution

The fourth proportional to 1,255.92, 1,881.96 and 561.84 is: 841.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.92 : 1,881.96 = 561.84 : x
  2. Step 2: Convert to fraction form
    1,255.92/1,881.96 = 561.84/x
  3. Step 3: Cross multiply
    1,255.92x = 1,881.96 × 561.84
  4. Step 4: Simplify right side
    1,255.92x = 1,057,360.41
  5. Step 5: Solve for x
    x = 1,057,360.41/1,255.92
  6. Step 6: Final answer
    x = 841.90

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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.