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Finding the Fourth Proportional to 1,514.90, 2,272.43 and 785.90

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Solution

The fourth proportional to 1,514.90, 2,272.43 and 785.90 is: 1,178.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,514.90 : 2,272.43 = 785.90 : x
  2. Step 2: Convert to fraction form
    1,514.90/2,272.43 = 785.90/x
  3. Step 3: Cross multiply
    1,514.90x = 2,272.43 × 785.90
  4. Step 4: Simplify right side
    1,514.90x = 1,785,902.74
  5. Step 5: Solve for x
    x = 1,785,902.74/1,514.90
  6. Step 6: Final answer
    x = 1,178.89

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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.