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Finding the Fourth Proportional to 2,937.19, 4,405.78 and 989.39

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Solution

The fourth proportional to 2,937.19, 4,405.78 and 989.39 is: 1,484.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,937.19 : 4,405.78 = 989.39 : x
  2. Step 2: Convert to fraction form
    2,937.19/4,405.78 = 989.39/x
  3. Step 3: Cross multiply
    2,937.19x = 4,405.78 × 989.39
  4. Step 4: Simplify right side
    2,937.19x = 4,359,034.67
  5. Step 5: Solve for x
    x = 4,359,034.67/2,937.19
  6. Step 6: Final answer
    x = 1,484.08

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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.