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Finding the Fourth Proportional to 2,990.46, 4,485.12 and 910.08

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Solution

The fourth proportional to 2,990.46, 4,485.12 and 910.08 is: 1,364.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.46 : 4,485.12 = 910.08 : x
  2. Step 2: Convert to fraction form
    2,990.46/4,485.12 = 910.08/x
  3. Step 3: Cross multiply
    2,990.46x = 4,485.12 × 910.08
  4. Step 4: Simplify right side
    2,990.46x = 4,081,818.01
  5. Step 5: Solve for x
    x = 4,081,818.01/2,990.46
  6. Step 6: Final answer
    x = 1,364.95

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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.