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Finding the Fourth Proportional to 211.68, 315.04 and 210.40

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Solution

The fourth proportional to 211.68, 315.04 and 210.40 is: 313.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.68 : 315.04 = 210.40 : x
  2. Step 2: Convert to fraction form
    211.68/315.04 = 210.40/x
  3. Step 3: Cross multiply
    211.68x = 315.04 × 210.40
  4. Step 4: Simplify right side
    211.68x = 66,284.42
  5. Step 5: Solve for x
    x = 66,284.42/211.68
  6. Step 6: Final answer
    x = 313.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.