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Finding the Fourth Proportional to 211.77, 317.78 and 88.40

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Solution

The fourth proportional to 211.77, 317.78 and 88.40 is: 132.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.77 : 317.78 = 88.40 : x
  2. Step 2: Convert to fraction form
    211.77/317.78 = 88.40/x
  3. Step 3: Cross multiply
    211.77x = 317.78 × 88.40
  4. Step 4: Simplify right side
    211.77x = 28,089.72
  5. Step 5: Solve for x
    x = 28,089.72/211.77
  6. Step 6: Final answer
    x = 132.64

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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.