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Finding the Fourth Proportional to 2,947.32, 4,421.39 and 999

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Solution

The fourth proportional to 2,947.32, 4,421.39 and 999 is: 1,498.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,947.32 : 4,421.39 = 999 : x
  2. Step 2: Convert to fraction form
    2,947.32/4,421.39 = 999/x
  3. Step 3: Cross multiply
    2,947.32x = 4,421.39 × 999
  4. Step 4: Simplify right side
    2,947.32x = 4,416,963.62
  5. Step 5: Solve for x
    x = 4,416,963.62/2,947.32
  6. Step 6: Final answer
    x = 1,498.64

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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.