Home / 20,640.49-28,495.68-13,587.41

Finding the Fourth Proportional to 20,640.49, 28,495.68 and 13,587.41

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Solution

The fourth proportional to 20,640.49, 28,495.68 and 13,587.41 is: 18,758.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.49 : 28,495.68 = 13,587.41 : x
  2. Step 2: Convert to fraction form
    20,640.49/28,495.68 = 13,587.41/x
  3. Step 3: Cross multiply
    20,640.49x = 28,495.68 × 13,587.41
  4. Step 4: Simplify right side
    20,640.49x = 387,182,419.45
  5. Step 5: Solve for x
    x = 387,182,419.45/20,640.49
  6. Step 6: Final answer
    x = 18,758.40

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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.