Home / 21,326.40-31,989.60-19,771.20

Finding the Fourth Proportional to 21,326.40, 31,989.60 and 19,771.20

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Solution

The fourth proportional to 21,326.40, 31,989.60 and 19,771.20 is: 29,656.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,326.40 : 31,989.60 = 19,771.20 : x
  2. Step 2: Convert to fraction form
    21,326.40/31,989.60 = 19,771.20/x
  3. Step 3: Cross multiply
    21,326.40x = 31,989.60 × 19,771.20
  4. Step 4: Simplify right side
    21,326.40x = 632,472,779.52
  5. Step 5: Solve for x
    x = 632,472,779.52/21,326.40
  6. Step 6: Final answer
    x = 29,656.80

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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.