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Finding the Fourth Proportional to 19,920,986.10, 29,881,479.15 and 18,220,374.90

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Solution

The fourth proportional to 19,920,986.10, 29,881,479.15 and 18,220,374.90 is: 27,330,562.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920,986.10 : 29,881,479.15 = 18,220,374.90 : x
  2. Step 2: Convert to fraction form
    19,920,986.10/29,881,479.15 = 18,220,374.90/x
  3. Step 3: Cross multiply
    19,920,986.10x = 29,881,479.15 × 18,220,374.90
  4. Step 4: Simplify right side
    19,920,986.10x = 544,451,752,679,533.25
  5. Step 5: Solve for x
    x = 544,451,752,679,533.25/19,920,986.10
  6. Step 6: Final answer
    x = 27,330,562.35

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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.