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Finding the Fourth Proportional to 11,528.78, 15,911.79 and 9,040.46

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Solution

The fourth proportional to 11,528.78, 15,911.79 and 9,040.46 is: 12,477.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,528.78 : 15,911.79 = 9,040.46 : x
  2. Step 2: Convert to fraction form
    11,528.78/15,911.79 = 9,040.46/x
  3. Step 3: Cross multiply
    11,528.78x = 15,911.79 × 9,040.46
  4. Step 4: Simplify right side
    11,528.78x = 143,849,901.02
  5. Step 5: Solve for x
    x = 143,849,901.02/11,528.78
  6. Step 6: Final answer
    x = 12,477.46

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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.