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Finding the Fourth Proportional to 20,702,990.90, 31,054,486.36 and 20,702,990.90

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Solution

The fourth proportional to 20,702,990.90, 31,054,486.36 and 20,702,990.90 is: 31,054,486.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,702,990.90 : 31,054,486.36 = 20,702,990.90 : x
  2. Step 2: Convert to fraction form
    20,702,990.90/31,054,486.36 = 20,702,990.90/x
  3. Step 3: Cross multiply
    20,702,990.90x = 31,054,486.36 × 20,702,990.90
  4. Step 4: Simplify right side
    20,702,990.90x = 642,920,748,515,254.12
  5. Step 5: Solve for x
    x = 642,920,748,515,254.12/20,702,990.90
  6. Step 6: Final answer
    x = 31,054,486.36

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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.