Home / 78,585.11-117,876.51-19,420.79

Finding the Fourth Proportional to 78,585.11, 117,876.51 and 19,420.79

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Solution

The fourth proportional to 78,585.11, 117,876.51 and 19,420.79 is: 29,130.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,585.11 : 117,876.51 = 19,420.79 : x
  2. Step 2: Convert to fraction form
    78,585.11/117,876.51 = 19,420.79/x
  3. Step 3: Cross multiply
    78,585.11x = 117,876.51 × 19,420.79
  4. Step 4: Simplify right side
    78,585.11x = 2,289,254,357.26
  5. Step 5: Solve for x
    x = 2,289,254,357.26/78,585.11
  6. Step 6: Final answer
    x = 29,130.89

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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.