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Finding the Fourth Proportional to 479.86, 718.45 and 391.48

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Solution

The fourth proportional to 479.86, 718.45 and 391.48 is: 586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.86 : 718.45 = 391.48 : x
  2. Step 2: Convert to fraction form
    479.86/718.45 = 391.48/x
  3. Step 3: Cross multiply
    479.86x = 718.45 × 391.48
  4. Step 4: Simplify right side
    479.86x = 281,258.81
  5. Step 5: Solve for x
    x = 281,258.81/479.86
  6. Step 6: Final answer
    x = 586.13

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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.