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Finding the Fourth Proportional to 1,345.68, 2,017.58 and 728.73

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Solution

The fourth proportional to 1,345.68, 2,017.58 and 728.73 is: 1,092.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.68 : 2,017.58 = 728.73 : x
  2. Step 2: Convert to fraction form
    1,345.68/2,017.58 = 728.73/x
  3. Step 3: Cross multiply
    1,345.68x = 2,017.58 × 728.73
  4. Step 4: Simplify right side
    1,345.68x = 1,470,267.43
  5. Step 5: Solve for x
    x = 1,470,267.43/1,345.68
  6. Step 6: Final answer
    x = 1,092.58

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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.