Home / 21,000.40-28,904.52-19,790.80

Finding the Fourth Proportional to 21,000.40, 28,904.52 and 19,790.80

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Solution

The fourth proportional to 21,000.40, 28,904.52 and 19,790.80 is: 27,239.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.40 : 28,904.52 = 19,790.80 : x
  2. Step 2: Convert to fraction form
    21,000.40/28,904.52 = 19,790.80/x
  3. Step 3: Cross multiply
    21,000.40x = 28,904.52 × 19,790.80
  4. Step 4: Simplify right side
    21,000.40x = 572,043,574.42
  5. Step 5: Solve for x
    x = 572,043,574.42/21,000.40
  6. Step 6: Final answer
    x = 27,239.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.