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Finding the Fourth Proportional to 879.86, 1,319.86 and 392.96

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Solution

The fourth proportional to 879.86, 1,319.86 and 392.96 is: 589.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.86 : 1,319.86 = 392.96 : x
  2. Step 2: Convert to fraction form
    879.86/1,319.86 = 392.96/x
  3. Step 3: Cross multiply
    879.86x = 1,319.86 × 392.96
  4. Step 4: Simplify right side
    879.86x = 518,655.98
  5. Step 5: Solve for x
    x = 518,655.98/879.86
  6. Step 6: Final answer
    x = 589.47

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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.