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Finding the Fourth Proportional to 78,692,807.88, 108,559,011.78 and 51,180,697.80

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Solution

The fourth proportional to 78,692,807.88, 108,559,011.78 and 51,180,697.80 is: 70,605,257.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,692,807.88 : 108,559,011.78 = 51,180,697.80 : x
  2. Step 2: Convert to fraction form
    78,692,807.88/108,559,011.78 = 51,180,697.80/x
  3. Step 3: Cross multiply
    78,692,807.88x = 108,559,011.78 × 51,180,697.80
  4. Step 4: Simplify right side
    78,692,807.88x = 5,556,125,975,378,820
  5. Step 5: Solve for x
    x = 5,556,125,975,378,820/78,692,807.88
  6. Step 6: Final answer
    x = 70,605,257.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.