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Finding the Fourth Proportional to 18,909,845.70, 28,364,768.55 and 18,768,128.10

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Solution

The fourth proportional to 18,909,845.70, 28,364,768.55 and 18,768,128.10 is: 28,152,192.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909,845.70 : 28,364,768.55 = 18,768,128.10 : x
  2. Step 2: Convert to fraction form
    18,909,845.70/28,364,768.55 = 18,768,128.10/x
  3. Step 3: Cross multiply
    18,909,845.70x = 28,364,768.55 × 18,768,128.10
  4. Step 4: Simplify right side
    18,909,845.70x = 532,353,609,673,251.31
  5. Step 5: Solve for x
    x = 532,353,609,673,251.31/18,909,845.70
  6. Step 6: Final answer
    x = 28,152,192.15

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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.