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Finding the Fourth Proportional to 992.55, 1,488.90 and 262.13

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Solution

The fourth proportional to 992.55, 1,488.90 and 262.13 is: 393.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.55 : 1,488.90 = 262.13 : x
  2. Step 2: Convert to fraction form
    992.55/1,488.90 = 262.13/x
  3. Step 3: Cross multiply
    992.55x = 1,488.90 × 262.13
  4. Step 4: Simplify right side
    992.55x = 390,278.90
  5. Step 5: Solve for x
    x = 390,278.90/992.55
  6. Step 6: Final answer
    x = 393.21

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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.