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Finding the Fourth Proportional to 9,866.12, 13,615.19 and 5,390.12

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Solution

The fourth proportional to 9,866.12, 13,615.19 and 5,390.12 is: 7,438.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,866.12 : 13,615.19 = 5,390.12 : x
  2. Step 2: Convert to fraction form
    9,866.12/13,615.19 = 5,390.12/x
  3. Step 3: Cross multiply
    9,866.12x = 13,615.19 × 5,390.12
  4. Step 4: Simplify right side
    9,866.12x = 73,387,535.22
  5. Step 5: Solve for x
    x = 73,387,535.22/9,866.12
  6. Step 6: Final answer
    x = 7,438.34

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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.