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Finding the Fourth Proportional to 315.40, 435.16 and 215.84

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Solution

The fourth proportional to 315.40, 435.16 and 215.84 is: 297.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.40 : 435.16 = 215.84 : x
  2. Step 2: Convert to fraction form
    315.40/435.16 = 215.84/x
  3. Step 3: Cross multiply
    315.40x = 435.16 × 215.84
  4. Step 4: Simplify right side
    315.40x = 93,924.93
  5. Step 5: Solve for x
    x = 93,924.93/315.40
  6. Step 6: Final answer
    x = 297.80

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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.