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Finding the Fourth Proportional to 18,909,902.70, 28,364,854.05 and 18,768,185.10

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Solution

The fourth proportional to 18,909,902.70, 28,364,854.05 and 18,768,185.10 is: 28,152,277.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909,902.70 : 28,364,854.05 = 18,768,185.10 : x
  2. Step 2: Convert to fraction form
    18,909,902.70/28,364,854.05 = 18,768,185.10/x
  3. Step 3: Cross multiply
    18,909,902.70x = 28,364,854.05 × 18,768,185.10
  4. Step 4: Simplify right side
    18,909,902.70x = 532,356,831,144,884.69
  5. Step 5: Solve for x
    x = 532,356,831,144,884.69/18,909,902.70
  6. Step 6: Final answer
    x = 28,152,277.65

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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.