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Finding the Fourth Proportional to 387.54, 535.05 and 346.50

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Solution

The fourth proportional to 387.54, 535.05 and 346.50 is: 478.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.54 : 535.05 = 346.50 : x
  2. Step 2: Convert to fraction form
    387.54/535.05 = 346.50/x
  3. Step 3: Cross multiply
    387.54x = 535.05 × 346.50
  4. Step 4: Simplify right side
    387.54x = 185,394.83
  5. Step 5: Solve for x
    x = 185,394.83/387.54
  6. Step 6: Final answer
    x = 478.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.