Home / 78,280.21-117,438.54-25,686.51

Finding the Fourth Proportional to 78,280.21, 117,438.54 and 25,686.51

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Solution

The fourth proportional to 78,280.21, 117,438.54 and 25,686.51 is: 38,535.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,280.21 : 117,438.54 = 25,686.51 : x
  2. Step 2: Convert to fraction form
    78,280.21/117,438.54 = 25,686.51/x
  3. Step 3: Cross multiply
    78,280.21x = 117,438.54 × 25,686.51
  4. Step 4: Simplify right side
    78,280.21x = 3,016,586,232.10
  5. Step 5: Solve for x
    x = 3,016,586,232.10/78,280.21
  6. Step 6: Final answer
    x = 38,535.75

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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.