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Finding the Fourth Proportional to 1,486.47, 2,229.71 and 561.78

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Solution

The fourth proportional to 1,486.47, 2,229.71 and 561.78 is: 842.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.47 : 2,229.71 = 561.78 : x
  2. Step 2: Convert to fraction form
    1,486.47/2,229.71 = 561.78/x
  3. Step 3: Cross multiply
    1,486.47x = 2,229.71 × 561.78
  4. Step 4: Simplify right side
    1,486.47x = 1,252,606.48
  5. Step 5: Solve for x
    x = 1,252,606.48/1,486.47
  6. Step 6: Final answer
    x = 842.67

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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.