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Finding the Fourth Proportional to 992.15, 1,486.32 and 557.99

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Solution

The fourth proportional to 992.15, 1,486.32 and 557.99 is: 835.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.15 : 1,486.32 = 557.99 : x
  2. Step 2: Convert to fraction form
    992.15/1,486.32 = 557.99/x
  3. Step 3: Cross multiply
    992.15x = 1,486.32 × 557.99
  4. Step 4: Simplify right side
    992.15x = 829,351.70
  5. Step 5: Solve for x
    x = 829,351.70/992.15
  6. Step 6: Final answer
    x = 835.91

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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.