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Finding the Fourth Proportional to 10,661.54, 15,984.05 and 7,145.91

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Solution

The fourth proportional to 10,661.54, 15,984.05 and 7,145.91 is: 10,713.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,661.54 : 15,984.05 = 7,145.91 : x
  2. Step 2: Convert to fraction form
    10,661.54/15,984.05 = 7,145.91/x
  3. Step 3: Cross multiply
    10,661.54x = 15,984.05 × 7,145.91
  4. Step 4: Simplify right side
    10,661.54x = 114,220,547.01
  5. Step 5: Solve for x
    x = 114,220,547.01/10,661.54
  6. Step 6: Final answer
    x = 10,713.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.