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Finding the Fourth Proportional to 500.42, 750.71 and 211.90

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Solution

The fourth proportional to 500.42, 750.71 and 211.90 is: 317.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.42 : 750.71 = 211.90 : x
  2. Step 2: Convert to fraction form
    500.42/750.71 = 211.90/x
  3. Step 3: Cross multiply
    500.42x = 750.71 × 211.90
  4. Step 4: Simplify right side
    500.42x = 159,075.45
  5. Step 5: Solve for x
    x = 159,075.45/500.42
  6. Step 6: Final answer
    x = 317.88

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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.