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Finding the Fourth Proportional to 3,875.76, 5,814.12 and 1,280.40

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Solution

The fourth proportional to 3,875.76, 5,814.12 and 1,280.40 is: 1,920.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,875.76 : 5,814.12 = 1,280.40 : x
  2. Step 2: Convert to fraction form
    3,875.76/5,814.12 = 1,280.40/x
  3. Step 3: Cross multiply
    3,875.76x = 5,814.12 × 1,280.40
  4. Step 4: Simplify right side
    3,875.76x = 7,444,399.25
  5. Step 5: Solve for x
    x = 7,444,399.25/3,875.76
  6. Step 6: Final answer
    x = 1,920.76

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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.