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Finding the Fourth Proportional to 11,787.80, 17,681.70 and 7,122.20

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Solution

The fourth proportional to 11,787.80, 17,681.70 and 7,122.20 is: 10,683.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,787.80 : 17,681.70 = 7,122.20 : x
  2. Step 2: Convert to fraction form
    11,787.80/17,681.70 = 7,122.20/x
  3. Step 3: Cross multiply
    11,787.80x = 17,681.70 × 7,122.20
  4. Step 4: Simplify right side
    11,787.80x = 125,932,603.74
  5. Step 5: Solve for x
    x = 125,932,603.74/11,787.80
  6. Step 6: Final answer
    x = 10,683.30

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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.