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Finding the Fourth Proportional to 19,900.80, 29,870.40 and 16,982.40

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Solution

The fourth proportional to 19,900.80, 29,870.40 and 16,982.40 is: 25,489.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,900.80 : 29,870.40 = 16,982.40 : x
  2. Step 2: Convert to fraction form
    19,900.80/29,870.40 = 16,982.40/x
  3. Step 3: Cross multiply
    19,900.80x = 29,870.40 × 16,982.40
  4. Step 4: Simplify right side
    19,900.80x = 507,271,080.96
  5. Step 5: Solve for x
    x = 507,271,080.96/19,900.80
  6. Step 6: Final answer
    x = 25,489.98

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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.