Home / 20,355.30-28,090.80-13,636.35

Finding the Fourth Proportional to 20,355.30, 28,090.80 and 13,636.35

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Solution

The fourth proportional to 20,355.30, 28,090.80 and 13,636.35 is: 18,818.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,355.30 : 28,090.80 = 13,636.35 : x
  2. Step 2: Convert to fraction form
    20,355.30/28,090.80 = 13,636.35/x
  3. Step 3: Cross multiply
    20,355.30x = 28,090.80 × 13,636.35
  4. Step 4: Simplify right side
    20,355.30x = 383,055,980.58
  5. Step 5: Solve for x
    x = 383,055,980.58/20,355.30
  6. Step 6: Final answer
    x = 18,818.49

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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.