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Finding the Fourth Proportional to 618, 924.82 and 387

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Solution

The fourth proportional to 618, 924.82 and 387 is: 579.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    618 : 924.82 = 387 : x
  2. Step 2: Convert to fraction form
    618/924.82 = 387/x
  3. Step 3: Cross multiply
    618x = 924.82 × 387
  4. Step 4: Simplify right side
    618x = 357,905.34
  5. Step 5: Solve for x
    x = 357,905.34/618
  6. Step 6: Final answer
    x = 579.13

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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.