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Finding the Fourth Proportional to 265.90, 398.50 and 128.99

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Solution

The fourth proportional to 265.90, 398.50 and 128.99 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.90 : 398.50 = 128.99 : x
  2. Step 2: Convert to fraction form
    265.90/398.50 = 128.99/x
  3. Step 3: Cross multiply
    265.90x = 398.50 × 128.99
  4. Step 4: Simplify right side
    265.90x = 51,402.52
  5. Step 5: Solve for x
    x = 51,402.52/265.90
  6. Step 6: Final answer
    x = 193.32

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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.