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Finding the Fourth Proportional to 607.28, 910.80 and 387.80

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Solution

The fourth proportional to 607.28, 910.80 and 387.80 is: 581.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.28 : 910.80 = 387.80 : x
  2. Step 2: Convert to fraction form
    607.28/910.80 = 387.80/x
  3. Step 3: Cross multiply
    607.28x = 910.80 × 387.80
  4. Step 4: Simplify right side
    607.28x = 353,208.24
  5. Step 5: Solve for x
    x = 353,208.24/607.28
  6. Step 6: Final answer
    x = 581.62

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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.