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Finding the Fourth Proportional to 1,008.06, 1,390.64 and 672.13

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Solution

The fourth proportional to 1,008.06, 1,390.64 and 672.13 is: 927.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.06 : 1,390.64 = 672.13 : x
  2. Step 2: Convert to fraction form
    1,008.06/1,390.64 = 672.13/x
  3. Step 3: Cross multiply
    1,008.06x = 1,390.64 × 672.13
  4. Step 4: Simplify right side
    1,008.06x = 934,690.86
  5. Step 5: Solve for x
    x = 934,690.86/1,008.06
  6. Step 6: Final answer
    x = 927.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.