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Finding the Fourth Proportional to 8,920.39, 12,318.47 and 5,739.22

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Solution

The fourth proportional to 8,920.39, 12,318.47 and 5,739.22 is: 7,925.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.39 : 12,318.47 = 5,739.22 : x
  2. Step 2: Convert to fraction form
    8,920.39/12,318.47 = 5,739.22/x
  3. Step 3: Cross multiply
    8,920.39x = 12,318.47 × 5,739.22
  4. Step 4: Simplify right side
    8,920.39x = 70,698,409.39
  5. Step 5: Solve for x
    x = 70,698,409.39/8,920.39
  6. Step 6: Final answer
    x = 7,925.48

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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.