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Finding the Fourth Proportional to 3,870.76, 5,806.14 and 1,405.72

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Solution

The fourth proportional to 3,870.76, 5,806.14 and 1,405.72 is: 2,108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,870.76 : 5,806.14 = 1,405.72 : x
  2. Step 2: Convert to fraction form
    3,870.76/5,806.14 = 1,405.72/x
  3. Step 3: Cross multiply
    3,870.76x = 5,806.14 × 1,405.72
  4. Step 4: Simplify right side
    3,870.76x = 8,161,807.12
  5. Step 5: Solve for x
    x = 8,161,807.12/3,870.76
  6. Step 6: Final answer
    x = 2,108.58

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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.