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Finding the Fourth Proportional to 12,872,643.20, 19,308,964.80 and 3,897,641.60

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Solution

The fourth proportional to 12,872,643.20, 19,308,964.80 and 3,897,641.60 is: 5,846,462.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,872,643.20 : 19,308,964.80 = 3,897,641.60 : x
  2. Step 2: Convert to fraction form
    12,872,643.20/19,308,964.80 = 3,897,641.60/x
  3. Step 3: Cross multiply
    12,872,643.20x = 19,308,964.80 × 3,897,641.60
  4. Step 4: Simplify right side
    12,872,643.20x = 75,259,424,457,415.69
  5. Step 5: Solve for x
    x = 75,259,424,457,415.69/12,872,643.20
  6. Step 6: Final answer
    x = 5,846,462.40

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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.