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Finding the Fourth Proportional to 478.86, 719.00 and 391.28

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Solution

The fourth proportional to 478.86, 719.00 and 391.28 is: 587.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.86 : 719.00 = 391.28 : x
  2. Step 2: Convert to fraction form
    478.86/719.00 = 391.28/x
  3. Step 3: Cross multiply
    478.86x = 719.00 × 391.28
  4. Step 4: Simplify right side
    478.86x = 281,326.24
  5. Step 5: Solve for x
    x = 281,326.24/478.86
  6. Step 6: Final answer
    x = 587.50

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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.