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Finding the Fourth Proportional to 1,354.12, 1,866.50 and 911.88

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Solution

The fourth proportional to 1,354.12, 1,866.50 and 911.88 is: 1,256.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.12 : 1,866.50 = 911.88 : x
  2. Step 2: Convert to fraction form
    1,354.12/1,866.50 = 911.88/x
  3. Step 3: Cross multiply
    1,354.12x = 1,866.50 × 911.88
  4. Step 4: Simplify right side
    1,354.12x = 1,702,024.02
  5. Step 5: Solve for x
    x = 1,702,024.02/1,354.12
  6. Step 6: Final answer
    x = 1,256.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.