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Finding the Fourth Proportional to 487.98, 730.59 and 389.98

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Solution

The fourth proportional to 487.98, 730.59 and 389.98 is: 583.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.98 : 730.59 = 389.98 : x
  2. Step 2: Convert to fraction form
    487.98/730.59 = 389.98/x
  3. Step 3: Cross multiply
    487.98x = 730.59 × 389.98
  4. Step 4: Simplify right side
    487.98x = 284,915.49
  5. Step 5: Solve for x
    x = 284,915.49/487.98
  6. Step 6: Final answer
    x = 583.87

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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.