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Finding the Fourth Proportional to 2,900.77, 4,001.25 and 2,143.77

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Solution

The fourth proportional to 2,900.77, 4,001.25 and 2,143.77 is: 2,957.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,900.77 : 4,001.25 = 2,143.77 : x
  2. Step 2: Convert to fraction form
    2,900.77/4,001.25 = 2,143.77/x
  3. Step 3: Cross multiply
    2,900.77x = 4,001.25 × 2,143.77
  4. Step 4: Simplify right side
    2,900.77x = 8,577,763.20
  5. Step 5: Solve for x
    x = 8,577,763.20/2,900.77
  6. Step 6: Final answer
    x = 2,957.07

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Half scale
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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.