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Finding the Fourth Proportional to 278,909,813.40, 418,364,720.10 and 261,903,701.40

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Solution

The fourth proportional to 278,909,813.40, 418,364,720.10 and 261,903,701.40 is: 392,855,552.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,909,813.40 : 418,364,720.10 = 261,903,701.40 : x
  2. Step 2: Convert to fraction form
    278,909,813.40/418,364,720.10 = 261,903,701.40/x
  3. Step 3: Cross multiply
    278,909,813.40x = 418,364,720.10 × 261,903,701.40
  4. Step 4: Simplify right side
    278,909,813.40x = 109,571,268,729,364,992
  5. Step 5: Solve for x
    x = 109,571,268,729,364,992/278,909,813.40
  6. Step 6: Final answer
    x = 392,855,552.10

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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.