Home / 20,985.87-28,959.89-11,425.94

Finding the Fourth Proportional to 20,985.87, 28,959.89 and 11,425.94

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Solution

The fourth proportional to 20,985.87, 28,959.89 and 11,425.94 is: 15,767.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.87 : 28,959.89 = 11,425.94 : x
  2. Step 2: Convert to fraction form
    20,985.87/28,959.89 = 11,425.94/x
  3. Step 3: Cross multiply
    20,985.87x = 28,959.89 × 11,425.94
  4. Step 4: Simplify right side
    20,985.87x = 330,893,980.82
  5. Step 5: Solve for x
    x = 330,893,980.82/20,985.87
  6. Step 6: Final answer
    x = 15,767.47

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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.