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Finding the Fourth Proportional to 713.19, 1,070.60 and 672.69

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Solution

The fourth proportional to 713.19, 1,070.60 and 672.69 is: 1,009.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.19 : 1,070.60 = 672.69 : x
  2. Step 2: Convert to fraction form
    713.19/1,070.60 = 672.69/x
  3. Step 3: Cross multiply
    713.19x = 1,070.60 × 672.69
  4. Step 4: Simplify right side
    713.19x = 720,181.91
  5. Step 5: Solve for x
    x = 720,181.91/713.19
  6. Step 6: Final answer
    x = 1,009.80

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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.