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Finding the Fourth Proportional to 388.90, 534.28 and 347.99

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Solution

The fourth proportional to 388.90, 534.28 and 347.99 is: 478.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.90 : 534.28 = 347.99 : x
  2. Step 2: Convert to fraction form
    388.90/534.28 = 347.99/x
  3. Step 3: Cross multiply
    388.90x = 534.28 × 347.99
  4. Step 4: Simplify right side
    388.90x = 185,922.36
  5. Step 5: Solve for x
    x = 185,922.36/388.90
  6. Step 6: Final answer
    x = 478.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.