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Finding the Fourth Proportional to 315.51, 435.51 and 215.99

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Solution

The fourth proportional to 315.51, 435.51 and 215.99 is: 298.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.51 : 435.51 = 215.99 : x
  2. Step 2: Convert to fraction form
    315.51/435.51 = 215.99/x
  3. Step 3: Cross multiply
    315.51x = 435.51 × 215.99
  4. Step 4: Simplify right side
    315.51x = 94,063.63
  5. Step 5: Solve for x
    x = 94,063.63/315.51
  6. Step 6: Final answer
    x = 298.13

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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.