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Finding the Fourth Proportional to 11,485.54, 15,851.78 and 7,011.90

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Solution

The fourth proportional to 11,485.54, 15,851.78 and 7,011.90 is: 9,677.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,485.54 : 15,851.78 = 7,011.90 : x
  2. Step 2: Convert to fraction form
    11,485.54/15,851.78 = 7,011.90/x
  3. Step 3: Cross multiply
    11,485.54x = 15,851.78 × 7,011.90
  4. Step 4: Simplify right side
    11,485.54x = 111,151,096.18
  5. Step 5: Solve for x
    x = 111,151,096.18/11,485.54
  6. Step 6: Final answer
    x = 9,677.48

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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.