Home / 20,386.95-28,131.87-11,886.81

Finding the Fourth Proportional to 20,386.95, 28,131.87 and 11,886.81

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Solution

The fourth proportional to 20,386.95, 28,131.87 and 11,886.81 is: 16,402.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,386.95 : 28,131.87 = 11,886.81 : x
  2. Step 2: Convert to fraction form
    20,386.95/28,131.87 = 11,886.81/x
  3. Step 3: Cross multiply
    20,386.95x = 28,131.87 × 11,886.81
  4. Step 4: Simplify right side
    20,386.95x = 334,398,193.63
  5. Step 5: Solve for x
    x = 334,398,193.63/20,386.95
  6. Step 6: Final answer
    x = 16,402.56

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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.