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Finding the Fourth Proportional to 315.90, 435.81 and 191.46

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Solution

The fourth proportional to 315.90, 435.81 and 191.46 is: 264.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.90 : 435.81 = 191.46 : x
  2. Step 2: Convert to fraction form
    315.90/435.81 = 191.46/x
  3. Step 3: Cross multiply
    315.90x = 435.81 × 191.46
  4. Step 4: Simplify right side
    315.90x = 83,442.53
  5. Step 5: Solve for x
    x = 83,442.53/315.90
  6. Step 6: Final answer
    x = 264.14

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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.