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Finding the Fourth Proportional to 992.32, 1,487.00 and 679.57

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Solution

The fourth proportional to 992.32, 1,487.00 and 679.57 is: 1,018.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.32 : 1,487.00 = 679.57 : x
  2. Step 2: Convert to fraction form
    992.32/1,487.00 = 679.57/x
  3. Step 3: Cross multiply
    992.32x = 1,487.00 × 679.57
  4. Step 4: Simplify right side
    992.32x = 1,010,518.57
  5. Step 5: Solve for x
    x = 1,010,518.57/992.32
  6. Step 6: Final answer
    x = 1,018.34

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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.