Home / 30,720.60-42,407.51-20,654.89

Finding the Fourth Proportional to 30,720.60, 42,407.51 and 20,654.89

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Solution

The fourth proportional to 30,720.60, 42,407.51 and 20,654.89 is: 28,512.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.60 : 42,407.51 = 20,654.89 : x
  2. Step 2: Convert to fraction form
    30,720.60/42,407.51 = 20,654.89/x
  3. Step 3: Cross multiply
    30,720.60x = 42,407.51 × 20,654.89
  4. Step 4: Simplify right side
    30,720.60x = 875,922,454.22
  5. Step 5: Solve for x
    x = 875,922,454.22/30,720.60
  6. Step 6: Final answer
    x = 28,512.54

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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.