Home / 20,986.40-31,447.20-17,681.60

Finding the Fourth Proportional to 20,986.40, 31,447.20 and 17,681.60

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Solution

The fourth proportional to 20,986.40, 31,447.20 and 17,681.60 is: 26,495.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,986.40 : 31,447.20 = 17,681.60 : x
  2. Step 2: Convert to fraction form
    20,986.40/31,447.20 = 17,681.60/x
  3. Step 3: Cross multiply
    20,986.40x = 31,447.20 × 17,681.60
  4. Step 4: Simplify right side
    20,986.40x = 556,036,811.52
  5. Step 5: Solve for x
    x = 556,036,811.52/20,986.40
  6. Step 6: Final answer
    x = 26,495.10

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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.