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Finding the Fourth Proportional to 11,415.90, 17,123.61 and 5,259.90

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Solution

The fourth proportional to 11,415.90, 17,123.61 and 5,259.90 is: 7,889.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,415.90 : 17,123.61 = 5,259.90 : x
  2. Step 2: Convert to fraction form
    11,415.90/17,123.61 = 5,259.90/x
  3. Step 3: Cross multiply
    11,415.90x = 17,123.61 × 5,259.90
  4. Step 4: Simplify right side
    11,415.90x = 90,068,476.24
  5. Step 5: Solve for x
    x = 90,068,476.24/11,415.90
  6. Step 6: Final answer
    x = 7,889.74

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1.5x scale

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.