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Finding the Fourth Proportional to 611,154.20, 916,511.70 and 211,687.40

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Solution

The fourth proportional to 611,154.20, 916,511.70 and 211,687.40 is: 317,455.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,154.20 : 916,511.70 = 211,687.40 : x
  2. Step 2: Convert to fraction form
    611,154.20/916,511.70 = 211,687.40/x
  3. Step 3: Cross multiply
    611,154.20x = 916,511.70 × 211,687.40
  4. Step 4: Simplify right side
    611,154.20x = 194,013,978,842.58
  5. Step 5: Solve for x
    x = 194,013,978,842.58/611,154.20
  6. Step 6: Final answer
    x = 317,455.04

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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.