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Finding the Fourth Proportional to 707.66, 1,054.31 and 672.80

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Solution

The fourth proportional to 707.66, 1,054.31 and 672.80 is: 1,002.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.66 : 1,054.31 = 672.80 : x
  2. Step 2: Convert to fraction form
    707.66/1,054.31 = 672.80/x
  3. Step 3: Cross multiply
    707.66x = 1,054.31 × 672.80
  4. Step 4: Simplify right side
    707.66x = 709,339.59
  5. Step 5: Solve for x
    x = 709,339.59/707.66
  6. Step 6: Final answer
    x = 1,002.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.