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Finding the Fourth Proportional to 3,478.74, 4,800.64 and 1,987.12

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Solution

The fourth proportional to 3,478.74, 4,800.64 and 1,987.12 is: 2,742.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478.74 : 4,800.64 = 1,987.12 : x
  2. Step 2: Convert to fraction form
    3,478.74/4,800.64 = 1,987.12/x
  3. Step 3: Cross multiply
    3,478.74x = 4,800.64 × 1,987.12
  4. Step 4: Simplify right side
    3,478.74x = 9,539,447.76
  5. Step 5: Solve for x
    x = 9,539,447.76/3,478.74
  6. Step 6: Final answer
    x = 2,742.21

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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.