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Finding the Fourth Proportional to 478.48, 714.28 and 405.60

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Solution

The fourth proportional to 478.48, 714.28 and 405.60 is: 605.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.48 : 714.28 = 405.60 : x
  2. Step 2: Convert to fraction form
    478.48/714.28 = 405.60/x
  3. Step 3: Cross multiply
    478.48x = 714.28 × 405.60
  4. Step 4: Simplify right side
    478.48x = 289,711.97
  5. Step 5: Solve for x
    x = 289,711.97/478.48
  6. Step 6: Final answer
    x = 605.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.