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Finding the Fourth Proportional to 478.19, 715.79 and 437.81

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Solution

The fourth proportional to 478.19, 715.79 and 437.81 is: 655.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.19 : 715.79 = 437.81 : x
  2. Step 2: Convert to fraction form
    478.19/715.79 = 437.81/x
  3. Step 3: Cross multiply
    478.19x = 715.79 × 437.81
  4. Step 4: Simplify right side
    478.19x = 313,377.54
  5. Step 5: Solve for x
    x = 313,377.54/478.19
  6. Step 6: Final answer
    x = 655.34

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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.