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Finding the Fourth Proportional to 384.80, 531.58 and 298.58

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Solution

The fourth proportional to 384.80, 531.58 and 298.58 is: 412.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.80 : 531.58 = 298.58 : x
  2. Step 2: Convert to fraction form
    384.80/531.58 = 298.58/x
  3. Step 3: Cross multiply
    384.80x = 531.58 × 298.58
  4. Step 4: Simplify right side
    384.80x = 158,719.16
  5. Step 5: Solve for x
    x = 158,719.16/384.80
  6. Step 6: Final answer
    x = 412.47

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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.