Home / 20,866.88-31,261.92-10,478.40

Finding the Fourth Proportional to 20,866.88, 31,261.92 and 10,478.40

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Solution

The fourth proportional to 20,866.88, 31,261.92 and 10,478.40 is: 15,698.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,866.88 : 31,261.92 = 10,478.40 : x
  2. Step 2: Convert to fraction form
    20,866.88/31,261.92 = 10,478.40/x
  3. Step 3: Cross multiply
    20,866.88x = 31,261.92 × 10,478.40
  4. Step 4: Simplify right side
    20,866.88x = 327,574,902.53
  5. Step 5: Solve for x
    x = 327,574,902.53/20,866.88
  6. Step 6: Final answer
    x = 15,698.32

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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.