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Finding the Fourth Proportional to 20,640.51, 30,960.86 and 5,058.14

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Solution

The fourth proportional to 20,640.51, 30,960.86 and 5,058.14 is: 7,587.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.51 : 30,960.86 = 5,058.14 : x
  2. Step 2: Convert to fraction form
    20,640.51/30,960.86 = 5,058.14/x
  3. Step 3: Cross multiply
    20,640.51x = 30,960.86 × 5,058.14
  4. Step 4: Simplify right side
    20,640.51x = 156,604,184.31
  5. Step 5: Solve for x
    x = 156,604,184.31/20,640.51
  6. Step 6: Final answer
    x = 7,587.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.