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Finding the Fourth Proportional to 611,156.70, 916,515.45 and 211,689.90

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Solution

The fourth proportional to 611,156.70, 916,515.45 and 211,689.90 is: 317,458.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,156.70 : 916,515.45 = 211,689.90 : x
  2. Step 2: Convert to fraction form
    611,156.70/916,515.45 = 211,689.90/x
  3. Step 3: Cross multiply
    611,156.70x = 916,515.45 × 211,689.90
  4. Step 4: Simplify right side
    611,156.70x = 194,017,063,958.96
  5. Step 5: Solve for x
    x = 194,017,063,958.96/611,156.70
  6. Step 6: Final answer
    x = 317,458.79

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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.