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Finding the Fourth Proportional to 8,391.47, 11,581.91 and 6,398.47

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Solution

The fourth proportional to 8,391.47, 11,581.91 and 6,398.47 is: 8,831.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.47 : 11,581.91 = 6,398.47 : x
  2. Step 2: Convert to fraction form
    8,391.47/11,581.91 = 6,398.47/x
  3. Step 3: Cross multiply
    8,391.47x = 11,581.91 × 6,398.47
  4. Step 4: Simplify right side
    8,391.47x = 74,106,466.72
  5. Step 5: Solve for x
    x = 74,106,466.72/8,391.47
  6. Step 6: Final answer
    x = 8,831.16

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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.