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Finding the Fourth Proportional to 992.50, 1,488.77 and 415.38

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Solution

The fourth proportional to 992.50, 1,488.77 and 415.38 is: 623.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.50 : 1,488.77 = 415.38 : x
  2. Step 2: Convert to fraction form
    992.50/1,488.77 = 415.38/x
  3. Step 3: Cross multiply
    992.50x = 1,488.77 × 415.38
  4. Step 4: Simplify right side
    992.50x = 618,405.28
  5. Step 5: Solve for x
    x = 618,405.28/992.50
  6. Step 6: Final answer
    x = 623.08

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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.