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Finding the Fourth Proportional to 992.86, 1,369.47 and 578.86

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Solution

The fourth proportional to 992.86, 1,369.47 and 578.86 is: 798.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.86 : 1,369.47 = 578.86 : x
  2. Step 2: Convert to fraction form
    992.86/1,369.47 = 578.86/x
  3. Step 3: Cross multiply
    992.86x = 1,369.47 × 578.86
  4. Step 4: Simplify right side
    992.86x = 792,731.40
  5. Step 5: Solve for x
    x = 792,731.40/992.86
  6. Step 6: Final answer
    x = 798.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.