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Finding the Fourth Proportional to 879.91, 1,319.49 and 392.63

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Solution

The fourth proportional to 879.91, 1,319.49 and 392.63 is: 588.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.91 : 1,319.49 = 392.63 : x
  2. Step 2: Convert to fraction form
    879.91/1,319.49 = 392.63/x
  3. Step 3: Cross multiply
    879.91x = 1,319.49 × 392.63
  4. Step 4: Simplify right side
    879.91x = 518,064.76
  5. Step 5: Solve for x
    x = 518,064.76/879.91
  6. Step 6: Final answer
    x = 588.77

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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.