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Finding the Fourth Proportional to 11,787.80, 17,681.70 and 5,210.60

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Solution

The fourth proportional to 11,787.80, 17,681.70 and 5,210.60 is: 7,815.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,787.80 : 17,681.70 = 5,210.60 : x
  2. Step 2: Convert to fraction form
    11,787.80/17,681.70 = 5,210.60/x
  3. Step 3: Cross multiply
    11,787.80x = 17,681.70 × 5,210.60
  4. Step 4: Simplify right side
    11,787.80x = 92,132,266.02
  5. Step 5: Solve for x
    x = 92,132,266.02/11,787.80
  6. Step 6: Final answer
    x = 7,815.90

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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.