Home / 21,167.20-31,750.80-6,378.40

Finding the Fourth Proportional to 21,167.20, 31,750.80 and 6,378.40

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Solution

The fourth proportional to 21,167.20, 31,750.80 and 6,378.40 is: 9,567.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,167.20 : 31,750.80 = 6,378.40 : x
  2. Step 2: Convert to fraction form
    21,167.20/31,750.80 = 6,378.40/x
  3. Step 3: Cross multiply
    21,167.20x = 31,750.80 × 6,378.40
  4. Step 4: Simplify right side
    21,167.20x = 202,519,302.72
  5. Step 5: Solve for x
    x = 202,519,302.72/21,167.20
  6. Step 6: Final answer
    x = 9,567.60

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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.