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Finding the Fourth Proportional to 992.49, 1,488.74 and 415.77

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Solution

The fourth proportional to 992.49, 1,488.74 and 415.77 is: 623.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.49 : 1,488.74 = 415.77 : x
  2. Step 2: Convert to fraction form
    992.49/1,488.74 = 415.77/x
  3. Step 3: Cross multiply
    992.49x = 1,488.74 × 415.77
  4. Step 4: Simplify right side
    992.49x = 618,971.35
  5. Step 5: Solve for x
    x = 618,971.35/992.49
  6. Step 6: Final answer
    x = 623.66

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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.