Home / 80,386.84-120,512.21-30,439.40

Finding the Fourth Proportional to 80,386.84, 120,512.21 and 30,439.40

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Solution

The fourth proportional to 80,386.84, 120,512.21 and 30,439.40 is: 45,633.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,386.84 : 120,512.21 = 30,439.40 : x
  2. Step 2: Convert to fraction form
    80,386.84/120,512.21 = 30,439.40/x
  3. Step 3: Cross multiply
    80,386.84x = 120,512.21 × 30,439.40
  4. Step 4: Simplify right side
    80,386.84x = 3,668,319,742.45
  5. Step 5: Solve for x
    x = 3,668,319,742.45/80,386.84
  6. Step 6: Final answer
    x = 45,633.34

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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.