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Finding the Fourth Proportional to 992.95, 1,488.21 and 559.20

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Solution

The fourth proportional to 992.95, 1,488.21 and 559.20 is: 838.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.95 : 1,488.21 = 559.20 : x
  2. Step 2: Convert to fraction form
    992.95/1,488.21 = 559.20/x
  3. Step 3: Cross multiply
    992.95x = 1,488.21 × 559.20
  4. Step 4: Simplify right side
    992.95x = 832,207.03
  5. Step 5: Solve for x
    x = 832,207.03/992.95
  6. Step 6: Final answer
    x = 838.12

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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.