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Finding the Fourth Proportional to 20,891,055.80, 31,336,583.70 and 20,891,055.80

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Solution

The fourth proportional to 20,891,055.80, 31,336,583.70 and 20,891,055.80 is: 31,336,583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891,055.80 : 31,336,583.70 = 20,891,055.80 : x
  2. Step 2: Convert to fraction form
    20,891,055.80/31,336,583.70 = 20,891,055.80/x
  3. Step 3: Cross multiply
    20,891,055.80x = 31,336,583.70 × 20,891,055.80
  4. Step 4: Simplify right side
    20,891,055.80x = 654,654,318,658,070.50
  5. Step 5: Solve for x
    x = 654,654,318,658,070.50/20,891,055.80
  6. Step 6: Final answer
    x = 31,336,583.70

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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.