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Finding the Fourth Proportional to 31,787.60, 47,681.40 and 20,152.40

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Solution

The fourth proportional to 31,787.60, 47,681.40 and 20,152.40 is: 30,228.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,787.60 : 47,681.40 = 20,152.40 : x
  2. Step 2: Convert to fraction form
    31,787.60/47,681.40 = 20,152.40/x
  3. Step 3: Cross multiply
    31,787.60x = 47,681.40 × 20,152.40
  4. Step 4: Simplify right side
    31,787.60x = 960,894,645.36
  5. Step 5: Solve for x
    x = 960,894,645.36/31,787.60
  6. Step 6: Final answer
    x = 30,228.60

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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.