Home / 78,586.11-117,878.01-19,421.79

Finding the Fourth Proportional to 78,586.11, 117,878.01 and 19,421.79

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Solution

The fourth proportional to 78,586.11, 117,878.01 and 19,421.79 is: 29,132.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,586.11 : 117,878.01 = 19,421.79 : x
  2. Step 2: Convert to fraction form
    78,586.11/117,878.01 = 19,421.79/x
  3. Step 3: Cross multiply
    78,586.11x = 117,878.01 × 19,421.79
  4. Step 4: Simplify right side
    78,586.11x = 2,289,401,955.84
  5. Step 5: Solve for x
    x = 2,289,401,955.84/78,586.11
  6. Step 6: Final answer
    x = 29,132.40

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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.