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Finding the Fourth Proportional to 399.10, 598.35 and 155.50

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Solution

The fourth proportional to 399.10, 598.35 and 155.50 is: 233.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.10 : 598.35 = 155.50 : x
  2. Step 2: Convert to fraction form
    399.10/598.35 = 155.50/x
  3. Step 3: Cross multiply
    399.10x = 598.35 × 155.50
  4. Step 4: Simplify right side
    399.10x = 93,043.43
  5. Step 5: Solve for x
    x = 93,043.43/399.10
  6. Step 6: Final answer
    x = 233.13

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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.