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Finding the Fourth Proportional to 1,254.50, 1,879.34 and 761.06

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Solution

The fourth proportional to 1,254.50, 1,879.34 and 761.06 is: 1,140.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.50 : 1,879.34 = 761.06 : x
  2. Step 2: Convert to fraction form
    1,254.50/1,879.34 = 761.06/x
  3. Step 3: Cross multiply
    1,254.50x = 1,879.34 × 761.06
  4. Step 4: Simplify right side
    1,254.50x = 1,430,283.01
  5. Step 5: Solve for x
    x = 1,430,283.01/1,254.50
  6. Step 6: Final answer
    x = 1,140.13

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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.