Home / 20,986,720.12-31,456,200.57-12,771,242.79

Finding the Fourth Proportional to 20,986,720.12, 31,456,200.57 and 12,771,242.79

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Solution

The fourth proportional to 20,986,720.12, 31,456,200.57 and 12,771,242.79 is: 19,142,332.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986,720.12 : 31,456,200.57 = 12,771,242.79 : x
  2. Step 2: Convert to fraction form
    20,986,720.12/31,456,200.57 = 12,771,242.79/x
  3. Step 3: Cross multiply
    20,986,720.12x = 31,456,200.57 × 12,771,242.79
  4. Step 4: Simplify right side
    20,986,720.12x = 401,734,774,730,406.38
  5. Step 5: Solve for x
    x = 401,734,774,730,406.38/20,986,720.12
  6. Step 6: Final answer
    x = 19,142,332.51

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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.