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Finding the Fourth Proportional to 1,119.72, 1,678.37 and 469.70

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Solution

The fourth proportional to 1,119.72, 1,678.37 and 469.70 is: 704.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.72 : 1,678.37 = 469.70 : x
  2. Step 2: Convert to fraction form
    1,119.72/1,678.37 = 469.70/x
  3. Step 3: Cross multiply
    1,119.72x = 1,678.37 × 469.70
  4. Step 4: Simplify right side
    1,119.72x = 788,319.65
  5. Step 5: Solve for x
    x = 788,319.65/1,119.72
  6. Step 6: Final answer
    x = 704.03

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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.