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Finding the Fourth Proportional to 1,392.12, 2,088.86 and 651.78

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Solution

The fourth proportional to 1,392.12, 2,088.86 and 651.78 is: 977.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.12 : 2,088.86 = 651.78 : x
  2. Step 2: Convert to fraction form
    1,392.12/2,088.86 = 651.78/x
  3. Step 3: Cross multiply
    1,392.12x = 2,088.86 × 651.78
  4. Step 4: Simplify right side
    1,392.12x = 1,361,474.43
  5. Step 5: Solve for x
    x = 1,361,474.43/1,392.12
  6. Step 6: Final answer
    x = 977.99

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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.