Home / 78,077.80-117,117-18,913.36

Finding the Fourth Proportional to 78,077.80, 117,117 and 18,913.36

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Solution

The fourth proportional to 78,077.80, 117,117 and 18,913.36 is: 28,370.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,077.80 : 117,117 = 18,913.36 : x
  2. Step 2: Convert to fraction form
    78,077.80/117,117 = 18,913.36/x
  3. Step 3: Cross multiply
    78,077.80x = 117,117 × 18,913.36
  4. Step 4: Simplify right side
    78,077.80x = 2,215,075,983.12
  5. Step 5: Solve for x
    x = 2,215,075,983.12/78,077.80
  6. Step 6: Final answer
    x = 28,370.11

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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.