Home / 28,785.27-39,720.98-21,235.80

Finding the Fourth Proportional to 28,785.27, 39,720.98 and 21,235.80

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Solution

The fourth proportional to 28,785.27, 39,720.98 and 21,235.80 is: 29,303.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,785.27 : 39,720.98 = 21,235.80 : x
  2. Step 2: Convert to fraction form
    28,785.27/39,720.98 = 21,235.80/x
  3. Step 3: Cross multiply
    28,785.27x = 39,720.98 × 21,235.80
  4. Step 4: Simplify right side
    28,785.27x = 843,506,787.08
  5. Step 5: Solve for x
    x = 843,506,787.08/28,785.27
  6. Step 6: Final answer
    x = 29,303.42

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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.