Home / 20,941.68-28,907.12-13,870.40

Finding the Fourth Proportional to 20,941.68, 28,907.12 and 13,870.40

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Solution

The fourth proportional to 20,941.68, 28,907.12 and 13,870.40 is: 19,146.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,941.68 : 28,907.12 = 13,870.40 : x
  2. Step 2: Convert to fraction form
    20,941.68/28,907.12 = 13,870.40/x
  3. Step 3: Cross multiply
    20,941.68x = 28,907.12 × 13,870.40
  4. Step 4: Simplify right side
    20,941.68x = 400,953,317.25
  5. Step 5: Solve for x
    x = 400,953,317.25/20,941.68
  6. Step 6: Final answer
    x = 19,146.19

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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.