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Finding the Fourth Proportional to 2,572.19, 3,857.85 and 840.81

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Solution

The fourth proportional to 2,572.19, 3,857.85 and 840.81 is: 1,261.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,572.19 : 3,857.85 = 840.81 : x
  2. Step 2: Convert to fraction form
    2,572.19/3,857.85 = 840.81/x
  3. Step 3: Cross multiply
    2,572.19x = 3,857.85 × 840.81
  4. Step 4: Simplify right side
    2,572.19x = 3,243,718.86
  5. Step 5: Solve for x
    x = 3,243,718.86/2,572.19
  6. Step 6: Final answer
    x = 1,261.07

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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.