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Finding the Fourth Proportional to 2,807.19, 4,210.92 and 859.55

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Solution

The fourth proportional to 2,807.19, 4,210.92 and 859.55 is: 1,289.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.19 : 4,210.92 = 859.55 : x
  2. Step 2: Convert to fraction form
    2,807.19/4,210.92 = 859.55/x
  3. Step 3: Cross multiply
    2,807.19x = 4,210.92 × 859.55
  4. Step 4: Simplify right side
    2,807.19x = 3,619,475.23
  5. Step 5: Solve for x
    x = 3,619,475.23/2,807.19
  6. Step 6: Final answer
    x = 1,289.36

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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.