Home / 81,327.36-121,920.84-31,442.40

Finding the Fourth Proportional to 81,327.36, 121,920.84 and 31,442.40

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Solution

The fourth proportional to 81,327.36, 121,920.84 and 31,442.40 is: 47,136.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,327.36 : 121,920.84 = 31,442.40 : x
  2. Step 2: Convert to fraction form
    81,327.36/121,920.84 = 31,442.40/x
  3. Step 3: Cross multiply
    81,327.36x = 121,920.84 × 31,442.40
  4. Step 4: Simplify right side
    81,327.36x = 3,833,483,819.62
  5. Step 5: Solve for x
    x = 3,833,483,819.62/81,327.36
  6. Step 6: Final answer
    x = 47,136.46

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1.5x scale

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.