Home / 30,991.36-42,754.26-20,916.76

Finding the Fourth Proportional to 30,991.36, 42,754.26 and 20,916.76

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Solution

The fourth proportional to 30,991.36, 42,754.26 and 20,916.76 is: 28,855.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,991.36 : 42,754.26 = 20,916.76 : x
  2. Step 2: Convert to fraction form
    30,991.36/42,754.26 = 20,916.76/x
  3. Step 3: Cross multiply
    30,991.36x = 42,754.26 × 20,916.76
  4. Step 4: Simplify right side
    30,991.36x = 894,280,595.40
  5. Step 5: Solve for x
    x = 894,280,595.40/30,991.36
  6. Step 6: Final answer
    x = 28,855.80

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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.