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Finding the Fourth Proportional to 9,903.12, 13,680.54 and 7,911.06

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Solution

The fourth proportional to 9,903.12, 13,680.54 and 7,911.06 is: 10,928.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,903.12 : 13,680.54 = 7,911.06 : x
  2. Step 2: Convert to fraction form
    9,903.12/13,680.54 = 7,911.06/x
  3. Step 3: Cross multiply
    9,903.12x = 13,680.54 × 7,911.06
  4. Step 4: Simplify right side
    9,903.12x = 108,227,572.77
  5. Step 5: Solve for x
    x = 108,227,572.77/9,903.12
  6. Step 6: Final answer
    x = 10,928.63

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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.