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Finding the Fourth Proportional to 3,187.68, 4,398.84 and 1,790.40

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Solution

The fourth proportional to 3,187.68, 4,398.84 and 1,790.40 is: 2,470.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,187.68 : 4,398.84 = 1,790.40 : x
  2. Step 2: Convert to fraction form
    3,187.68/4,398.84 = 1,790.40/x
  3. Step 3: Cross multiply
    3,187.68x = 4,398.84 × 1,790.40
  4. Step 4: Simplify right side
    3,187.68x = 7,875,683.14
  5. Step 5: Solve for x
    x = 7,875,683.14/3,187.68
  6. Step 6: Final answer
    x = 2,470.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.