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Finding the Fourth Proportional to 9,894.90, 13,655.12 and 5,418.57

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Solution

The fourth proportional to 9,894.90, 13,655.12 and 5,418.57 is: 7,477.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,894.90 : 13,655.12 = 5,418.57 : x
  2. Step 2: Convert to fraction form
    9,894.90/13,655.12 = 5,418.57/x
  3. Step 3: Cross multiply
    9,894.90x = 13,655.12 × 5,418.57
  4. Step 4: Simplify right side
    9,894.90x = 73,991,223.58
  5. Step 5: Solve for x
    x = 73,991,223.58/9,894.90
  6. Step 6: Final answer
    x = 7,477.71

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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.