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Finding the Fourth Proportional to 2,421.68, 3,632.84 and 778.72

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Solution

The fourth proportional to 2,421.68, 3,632.84 and 778.72 is: 1,168.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,421.68 : 3,632.84 = 778.72 : x
  2. Step 2: Convert to fraction form
    2,421.68/3,632.84 = 778.72/x
  3. Step 3: Cross multiply
    2,421.68x = 3,632.84 × 778.72
  4. Step 4: Simplify right side
    2,421.68x = 2,828,965.16
  5. Step 5: Solve for x
    x = 2,828,965.16/2,421.68
  6. Step 6: Final answer
    x = 1,168.18

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1.5x scale

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.