Home / 28,760.50-39,686.66-21,210.90

Finding the Fourth Proportional to 28,760.50, 39,686.66 and 21,210.90

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Solution

The fourth proportional to 28,760.50, 39,686.66 and 21,210.90 is: 29,268.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,760.50 : 39,686.66 = 21,210.90 : x
  2. Step 2: Convert to fraction form
    28,760.50/39,686.66 = 21,210.90/x
  3. Step 3: Cross multiply
    28,760.50x = 39,686.66 × 21,210.90
  4. Step 4: Simplify right side
    28,760.50x = 841,789,601.26
  5. Step 5: Solve for x
    x = 841,789,601.26/28,760.50
  6. Step 6: Final answer
    x = 29,268.95

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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.