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Finding the Fourth Proportional to 992.58, 1,487.52 and 342.72

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Solution

The fourth proportional to 992.58, 1,487.52 and 342.72 is: 513.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.58 : 1,487.52 = 342.72 : x
  2. Step 2: Convert to fraction form
    992.58/1,487.52 = 342.72/x
  3. Step 3: Cross multiply
    992.58x = 1,487.52 × 342.72
  4. Step 4: Simplify right side
    992.58x = 509,802.85
  5. Step 5: Solve for x
    x = 509,802.85/992.58
  6. Step 6: Final answer
    x = 513.61

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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.