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Finding the Fourth Proportional to 2,803.95, 4,206.55 and 856.31

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Solution

The fourth proportional to 2,803.95, 4,206.55 and 856.31 is: 1,284.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,803.95 : 4,206.55 = 856.31 : x
  2. Step 2: Convert to fraction form
    2,803.95/4,206.55 = 856.31/x
  3. Step 3: Cross multiply
    2,803.95x = 4,206.55 × 856.31
  4. Step 4: Simplify right side
    2,803.95x = 3,602,110.83
  5. Step 5: Solve for x
    x = 3,602,110.83/2,803.95
  6. Step 6: Final answer
    x = 1,284.66

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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.