Home / 30,878.82-42,627.48-20,687.40

Finding the Fourth Proportional to 30,878.82, 42,627.48 and 20,687.40

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Solution

The fourth proportional to 30,878.82, 42,627.48 and 20,687.40 is: 28,558.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,878.82 : 42,627.48 = 20,687.40 : x
  2. Step 2: Convert to fraction form
    30,878.82/42,627.48 = 20,687.40/x
  3. Step 3: Cross multiply
    30,878.82x = 42,627.48 × 20,687.40
  4. Step 4: Simplify right side
    30,878.82x = 881,851,729.75
  5. Step 5: Solve for x
    x = 881,851,729.75/30,878.82
  6. Step 6: Final answer
    x = 28,558.47

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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.