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Finding the Fourth Proportional to 13,307,978.40, 19,953,383.04 and 5,221,770.90

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Solution

The fourth proportional to 13,307,978.40, 19,953,383.04 and 5,221,770.90 is: 7,829,287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,307,978.40 : 19,953,383.04 = 5,221,770.90 : x
  2. Step 2: Convert to fraction form
    13,307,978.40/19,953,383.04 = 5,221,770.90/x
  3. Step 3: Cross multiply
    13,307,978.40x = 19,953,383.04 × 5,221,770.90
  4. Step 4: Simplify right side
    13,307,978.40x = 104,191,994,914,825.53
  5. Step 5: Solve for x
    x = 104,191,994,914,825.53/13,307,978.40
  6. Step 6: Final answer
    x = 7,829,287.95

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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.