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Finding the Fourth Proportional to 1,780.92, 2,670.54 and 989.76

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Solution

The fourth proportional to 1,780.92, 2,670.54 and 989.76 is: 1,484.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.92 : 2,670.54 = 989.76 : x
  2. Step 2: Convert to fraction form
    1,780.92/2,670.54 = 989.76/x
  3. Step 3: Cross multiply
    1,780.92x = 2,670.54 × 989.76
  4. Step 4: Simplify right side
    1,780.92x = 2,643,193.67
  5. Step 5: Solve for x
    x = 2,643,193.67/1,780.92
  6. Step 6: Final answer
    x = 1,484.17

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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.