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Finding the Fourth Proportional to 7,920.40, 11,881.81 and 2,989.93

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Solution

The fourth proportional to 7,920.40, 11,881.81 and 2,989.93 is: 4,485.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.40 : 11,881.81 = 2,989.93 : x
  2. Step 2: Convert to fraction form
    7,920.40/11,881.81 = 2,989.93/x
  3. Step 3: Cross multiply
    7,920.40x = 11,881.81 × 2,989.93
  4. Step 4: Simplify right side
    7,920.40x = 35,525,780.17
  5. Step 5: Solve for x
    x = 35,525,780.17/7,920.40
  6. Step 6: Final answer
    x = 4,485.35

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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.