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Finding the Fourth Proportional to 1,159.73, 1,739.15 and 428.81

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Solution

The fourth proportional to 1,159.73, 1,739.15 and 428.81 is: 643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,159.73 : 1,739.15 = 428.81 : x
  2. Step 2: Convert to fraction form
    1,159.73/1,739.15 = 428.81/x
  3. Step 3: Cross multiply
    1,159.73x = 1,739.15 × 428.81
  4. Step 4: Simplify right side
    1,159.73x = 745,764.26
  5. Step 5: Solve for x
    x = 745,764.26/1,159.73
  6. Step 6: Final answer
    x = 643.05

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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.