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Finding the Fourth Proportional to 1,187.99, 1,780.62 and 457.19

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Solution

The fourth proportional to 1,187.99, 1,780.62 and 457.19 is: 685.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.99 : 1,780.62 = 457.19 : x
  2. Step 2: Convert to fraction form
    1,187.99/1,780.62 = 457.19/x
  3. Step 3: Cross multiply
    1,187.99x = 1,780.62 × 457.19
  4. Step 4: Simplify right side
    1,187.99x = 814,081.66
  5. Step 5: Solve for x
    x = 814,081.66/1,187.99
  6. Step 6: Final answer
    x = 685.26

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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.