Home / 30,988.56-42,777.30-20,930.64

Finding the Fourth Proportional to 30,988.56, 42,777.30 and 20,930.64

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Solution

The fourth proportional to 30,988.56, 42,777.30 and 20,930.64 is: 28,893.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,988.56 : 42,777.30 = 20,930.64 : x
  2. Step 2: Convert to fraction form
    30,988.56/42,777.30 = 20,930.64/x
  3. Step 3: Cross multiply
    30,988.56x = 42,777.30 × 20,930.64
  4. Step 4: Simplify right side
    30,988.56x = 895,356,266.47
  5. Step 5: Solve for x
    x = 895,356,266.47/30,988.56
  6. Step 6: Final answer
    x = 28,893.12

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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.