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Finding the Fourth Proportional to 20,697,798.40, 31,046,697.60 and 20,556,080.80

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Solution

The fourth proportional to 20,697,798.40, 31,046,697.60 and 20,556,080.80 is: 30,834,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,697,798.40 : 31,046,697.60 = 20,556,080.80 : x
  2. Step 2: Convert to fraction form
    20,697,798.40/31,046,697.60 = 20,556,080.80/x
  3. Step 3: Cross multiply
    20,697,798.40x = 31,046,697.60 × 20,556,080.80
  4. Step 4: Simplify right side
    20,697,798.40x = 638,198,424,438,766.12
  5. Step 5: Solve for x
    x = 638,198,424,438,766.12/20,697,798.40
  6. Step 6: Final answer
    x = 30,834,121.20

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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.