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Finding the Fourth Proportional to 211.58, 291.70 and 152.65

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Solution

The fourth proportional to 211.58, 291.70 and 152.65 is: 210.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.58 : 291.70 = 152.65 : x
  2. Step 2: Convert to fraction form
    211.58/291.70 = 152.65/x
  3. Step 3: Cross multiply
    211.58x = 291.70 × 152.65
  4. Step 4: Simplify right side
    211.58x = 44,528.56
  5. Step 5: Solve for x
    x = 44,528.56/211.58
  6. Step 6: Final answer
    x = 210.46

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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.