Home / 20,561.31-28,368.63-13,854.51

Finding the Fourth Proportional to 20,561.31, 28,368.63 and 13,854.51

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Solution

The fourth proportional to 20,561.31, 28,368.63 and 13,854.51 is: 19,115.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,561.31 : 28,368.63 = 13,854.51 : x
  2. Step 2: Convert to fraction form
    20,561.31/28,368.63 = 13,854.51/x
  3. Step 3: Cross multiply
    20,561.31x = 28,368.63 × 13,854.51
  4. Step 4: Simplify right side
    20,561.31x = 393,033,468.02
  5. Step 5: Solve for x
    x = 393,033,468.02/20,561.31
  6. Step 6: Final answer
    x = 19,115.20

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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.