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Finding the Fourth Proportional to 478.68, 716.40 and 386.34

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Solution

The fourth proportional to 478.68, 716.40 and 386.34 is: 578.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.68 : 716.40 = 386.34 : x
  2. Step 2: Convert to fraction form
    478.68/716.40 = 386.34/x
  3. Step 3: Cross multiply
    478.68x = 716.40 × 386.34
  4. Step 4: Simplify right side
    478.68x = 276,773.98
  5. Step 5: Solve for x
    x = 276,773.98/478.68
  6. Step 6: Final answer
    x = 578.20

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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.