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Finding the Fourth Proportional to 2,806.95, 4,210.47 and 859.17

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Solution

The fourth proportional to 2,806.95, 4,210.47 and 859.17 is: 1,288.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,806.95 : 4,210.47 = 859.17 : x
  2. Step 2: Convert to fraction form
    2,806.95/4,210.47 = 859.17/x
  3. Step 3: Cross multiply
    2,806.95x = 4,210.47 × 859.17
  4. Step 4: Simplify right side
    2,806.95x = 3,617,509.51
  5. Step 5: Solve for x
    x = 3,617,509.51/2,806.95
  6. Step 6: Final answer
    x = 1,288.77

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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.