Home / 20,965.36-28,916.76-13,403.20

Finding the Fourth Proportional to 20,965.36, 28,916.76 and 13,403.20

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Solution

The fourth proportional to 20,965.36, 28,916.76 and 13,403.20 is: 18,486.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.36 : 28,916.76 = 13,403.20 : x
  2. Step 2: Convert to fraction form
    20,965.36/28,916.76 = 13,403.20/x
  3. Step 3: Cross multiply
    20,965.36x = 28,916.76 × 13,403.20
  4. Step 4: Simplify right side
    20,965.36x = 387,577,117.63
  5. Step 5: Solve for x
    x = 387,577,117.63/20,965.36
  6. Step 6: Final answer
    x = 18,486.55

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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.