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Finding the Fourth Proportional to 1,981.86, 2,973.35 and 665.72

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Solution

The fourth proportional to 1,981.86, 2,973.35 and 665.72 is: 998.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,981.86 : 2,973.35 = 665.72 : x
  2. Step 2: Convert to fraction form
    1,981.86/2,973.35 = 665.72/x
  3. Step 3: Cross multiply
    1,981.86x = 2,973.35 × 665.72
  4. Step 4: Simplify right side
    1,981.86x = 1,979,403.70
  5. Step 5: Solve for x
    x = 1,979,403.70/1,981.86
  6. Step 6: Final answer
    x = 998.76

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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.