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Finding the Fourth Proportional to 28,687,715.80, 42,973,512.90 and 17,871,818.20

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Solution

The fourth proportional to 28,687,715.80, 42,973,512.90 and 17,871,818.20 is: 26,771,556.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,687,715.80 : 42,973,512.90 = 17,871,818.20 : x
  2. Step 2: Convert to fraction form
    28,687,715.80/42,973,512.90 = 17,871,818.20/x
  3. Step 3: Cross multiply
    28,687,715.80x = 42,973,512.90 × 17,871,818.20
  4. Step 4: Simplify right side
    28,687,715.80x = 768,014,809,964,154.75
  5. Step 5: Solve for x
    x = 768,014,809,964,154.75/28,687,715.80
  6. Step 6: Final answer
    x = 26,771,556.69

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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.