Home / 20,731.40-31,097.10-6,880.40

Finding the Fourth Proportional to 20,731.40, 31,097.10 and 6,880.40

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Solution

The fourth proportional to 20,731.40, 31,097.10 and 6,880.40 is: 10,320.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.40 : 31,097.10 = 6,880.40 : x
  2. Step 2: Convert to fraction form
    20,731.40/31,097.10 = 6,880.40/x
  3. Step 3: Cross multiply
    20,731.40x = 31,097.10 × 6,880.40
  4. Step 4: Simplify right side
    20,731.40x = 213,960,486.84
  5. Step 5: Solve for x
    x = 213,960,486.84/20,731.40
  6. Step 6: Final answer
    x = 10,320.60

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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.