Home / 30,973.06-42,755.90-20,915.11

Finding the Fourth Proportional to 30,973.06, 42,755.90 and 20,915.11

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Solution

The fourth proportional to 30,973.06, 42,755.90 and 20,915.11 is: 28,871.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,973.06 : 42,755.90 = 20,915.11 : x
  2. Step 2: Convert to fraction form
    30,973.06/42,755.90 = 20,915.11/x
  3. Step 3: Cross multiply
    30,973.06x = 42,755.90 × 20,915.11
  4. Step 4: Simplify right side
    30,973.06x = 894,244,351.65
  5. Step 5: Solve for x
    x = 894,244,351.65/30,973.06
  6. Step 6: Final answer
    x = 28,871.68

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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.