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Finding the Fourth Proportional to 9,865.91, 13,615.06 and 5,389.79

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Solution

The fourth proportional to 9,865.91, 13,615.06 and 5,389.79 is: 7,437.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,865.91 : 13,615.06 = 5,389.79 : x
  2. Step 2: Convert to fraction form
    9,865.91/13,615.06 = 5,389.79/x
  3. Step 3: Cross multiply
    9,865.91x = 13,615.06 × 5,389.79
  4. Step 4: Simplify right side
    9,865.91x = 73,382,314.24
  5. Step 5: Solve for x
    x = 73,382,314.24/9,865.91
  6. Step 6: Final answer
    x = 7,437.97

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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.