Home / 120,138.48-165,851.28-77,731.20

Finding the Fourth Proportional to 120,138.48, 165,851.28 and 77,731.20

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Solution

The fourth proportional to 120,138.48, 165,851.28 and 77,731.20 is: 107,307.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,138.48 : 165,851.28 = 77,731.20 : x
  2. Step 2: Convert to fraction form
    120,138.48/165,851.28 = 77,731.20/x
  3. Step 3: Cross multiply
    120,138.48x = 165,851.28 × 77,731.20
  4. Step 4: Simplify right side
    120,138.48x = 12,891,819,015.94
  5. Step 5: Solve for x
    x = 12,891,819,015.94/120,138.48
  6. Step 6: Final answer
    x = 107,307.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.