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Finding the Fourth Proportional to 1,148.74, 1,720.98 and 840.73

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Solution

The fourth proportional to 1,148.74, 1,720.98 and 840.73 is: 1,259.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.74 : 1,720.98 = 840.73 : x
  2. Step 2: Convert to fraction form
    1,148.74/1,720.98 = 840.73/x
  3. Step 3: Cross multiply
    1,148.74x = 1,720.98 × 840.73
  4. Step 4: Simplify right side
    1,148.74x = 1,446,879.52
  5. Step 5: Solve for x
    x = 1,446,879.52/1,148.74
  6. Step 6: Final answer
    x = 1,259.54

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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.