Home / 8,920.04-12,309.58-5,781.68

Finding the Fourth Proportional to 8,920.04, 12,309.58 and 5,781.68

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Solution

The fourth proportional to 8,920.04, 12,309.58 and 5,781.68 is: 7,978.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.04 : 12,309.58 = 5,781.68 : x
  2. Step 2: Convert to fraction form
    8,920.04/12,309.58 = 5,781.68/x
  3. Step 3: Cross multiply
    8,920.04x = 12,309.58 × 5,781.68
  4. Step 4: Simplify right side
    8,920.04x = 71,170,052.49
  5. Step 5: Solve for x
    x = 71,170,052.49/8,920.04
  6. Step 6: Final answer
    x = 7,978.67

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1.5x scale

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.