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Finding the Fourth Proportional to 2,178.61, 3,267.52 and 639.25

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Solution

The fourth proportional to 2,178.61, 3,267.52 and 639.25 is: 958.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,178.61 : 3,267.52 = 639.25 : x
  2. Step 2: Convert to fraction form
    2,178.61/3,267.52 = 639.25/x
  3. Step 3: Cross multiply
    2,178.61x = 3,267.52 × 639.25
  4. Step 4: Simplify right side
    2,178.61x = 2,088,762.16
  5. Step 5: Solve for x
    x = 2,088,762.16/2,178.61
  6. Step 6: Final answer
    x = 958.76

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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.