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Finding the Fourth Proportional to 19,787.60, 29,681.40 and 18,912.80

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Solution

The fourth proportional to 19,787.60, 29,681.40 and 18,912.80 is: 28,369.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,787.60 : 29,681.40 = 18,912.80 : x
  2. Step 2: Convert to fraction form
    19,787.60/29,681.40 = 18,912.80/x
  3. Step 3: Cross multiply
    19,787.60x = 29,681.40 × 18,912.80
  4. Step 4: Simplify right side
    19,787.60x = 561,358,381.92
  5. Step 5: Solve for x
    x = 561,358,381.92/19,787.60
  6. Step 6: Final answer
    x = 28,369.20

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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.