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Finding the Fourth Proportional to 19,902.80, 29,854.20 and 12,904.40

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Solution

The fourth proportional to 19,902.80, 29,854.20 and 12,904.40 is: 19,356.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,902.80 : 29,854.20 = 12,904.40 : x
  2. Step 2: Convert to fraction form
    19,902.80/29,854.20 = 12,904.40/x
  3. Step 3: Cross multiply
    19,902.80x = 29,854.20 × 12,904.40
  4. Step 4: Simplify right side
    19,902.80x = 385,250,538.48
  5. Step 5: Solve for x
    x = 385,250,538.48/19,902.80
  6. Step 6: Final answer
    x = 19,356.60

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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.