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Finding the Fourth Proportional to 992.56, 1,487.77 and 436.77

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Solution

The fourth proportional to 992.56, 1,487.77 and 436.77 is: 654.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.56 : 1,487.77 = 436.77 : x
  2. Step 2: Convert to fraction form
    992.56/1,487.77 = 436.77/x
  3. Step 3: Cross multiply
    992.56x = 1,487.77 × 436.77
  4. Step 4: Simplify right side
    992.56x = 649,813.30
  5. Step 5: Solve for x
    x = 649,813.30/992.56
  6. Step 6: Final answer
    x = 654.68

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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.