Home / 30,720.38-42,372.28-20,506.26

Finding the Fourth Proportional to 30,720.38, 42,372.28 and 20,506.26

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Solution

The fourth proportional to 30,720.38, 42,372.28 and 20,506.26 is: 28,284.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,720.38 : 42,372.28 = 20,506.26 : x
  2. Step 2: Convert to fraction form
    30,720.38/42,372.28 = 20,506.26/x
  3. Step 3: Cross multiply
    30,720.38x = 42,372.28 × 20,506.26
  4. Step 4: Simplify right side
    30,720.38x = 868,896,990.47
  5. Step 5: Solve for x
    x = 868,896,990.47/30,720.38
  6. Step 6: Final answer
    x = 28,284.06

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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.