Home / 20,987.23-28,953.19-13,807.92

Finding the Fourth Proportional to 20,987.23, 28,953.19 and 13,807.92

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Solution

The fourth proportional to 20,987.23, 28,953.19 and 13,807.92 is: 19,048.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.23 : 28,953.19 = 13,807.92 : x
  2. Step 2: Convert to fraction form
    20,987.23/28,953.19 = 13,807.92/x
  3. Step 3: Cross multiply
    20,987.23x = 28,953.19 × 13,807.92
  4. Step 4: Simplify right side
    20,987.23x = 399,783,331.26
  5. Step 5: Solve for x
    x = 399,783,331.26/20,987.23
  6. Step 6: Final answer
    x = 19,048.89

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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.