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Finding the Fourth Proportional to 69,909,872.40, 104,872,681.80 and 21,387,340.80

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Solution

The fourth proportional to 69,909,872.40, 104,872,681.80 and 21,387,340.80 is: 32,083,419.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,909,872.40 : 104,872,681.80 = 21,387,340.80 : x
  2. Step 2: Convert to fraction form
    69,909,872.40/104,872,681.80 = 21,387,340.80/x
  3. Step 3: Cross multiply
    69,909,872.40x = 104,872,681.80 × 21,387,340.80
  4. Step 4: Simplify right side
    69,909,872.40x = 2,242,947,786,266,557.50
  5. Step 5: Solve for x
    x = 2,242,947,786,266,557.50/69,909,872.40
  6. Step 6: Final answer
    x = 32,083,419.83

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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.