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Finding the Fourth Proportional to 2,374.21, 3,561.36 and 642.79

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Solution

The fourth proportional to 2,374.21, 3,561.36 and 642.79 is: 964.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,374.21 : 3,561.36 = 642.79 : x
  2. Step 2: Convert to fraction form
    2,374.21/3,561.36 = 642.79/x
  3. Step 3: Cross multiply
    2,374.21x = 3,561.36 × 642.79
  4. Step 4: Simplify right side
    2,374.21x = 2,289,206.59
  5. Step 5: Solve for x
    x = 2,289,206.59/2,374.21
  6. Step 6: Final answer
    x = 964.20

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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.