Home / 30,513.77-42,114-20,945.76

Finding the Fourth Proportional to 30,513.77, 42,114 and 20,945.76

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Solution

The fourth proportional to 30,513.77, 42,114 and 20,945.76 is: 28,908.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,513.77 : 42,114 = 20,945.76 : x
  2. Step 2: Convert to fraction form
    30,513.77/42,114 = 20,945.76/x
  3. Step 3: Cross multiply
    30,513.77x = 42,114 × 20,945.76
  4. Step 4: Simplify right side
    30,513.77x = 882,109,736.64
  5. Step 5: Solve for x
    x = 882,109,736.64/30,513.77
  6. Step 6: Final answer
    x = 28,908.58

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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.