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Finding the Fourth Proportional to 992.95, 1,489.59 and 343.51

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Solution

The fourth proportional to 992.95, 1,489.59 and 343.51 is: 515.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.95 : 1,489.59 = 343.51 : x
  2. Step 2: Convert to fraction form
    992.95/1,489.59 = 343.51/x
  3. Step 3: Cross multiply
    992.95x = 1,489.59 × 343.51
  4. Step 4: Simplify right side
    992.95x = 511,689.06
  5. Step 5: Solve for x
    x = 511,689.06/992.95
  6. Step 6: Final answer
    x = 515.32

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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.