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Finding the Fourth Proportional to 5,643.68, 7,780.14 and 3,959.86

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Solution

The fourth proportional to 5,643.68, 7,780.14 and 3,959.86 is: 5,458.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,643.68 : 7,780.14 = 3,959.86 : x
  2. Step 2: Convert to fraction form
    5,643.68/7,780.14 = 3,959.86/x
  3. Step 3: Cross multiply
    5,643.68x = 7,780.14 × 3,959.86
  4. Step 4: Simplify right side
    5,643.68x = 30,808,265.18
  5. Step 5: Solve for x
    x = 30,808,265.18/5,643.68
  6. Step 6: Final answer
    x = 5,458.90

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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.