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Finding the Fourth Proportional to 1,963.40, 2,946.54 and 990.20

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Solution

The fourth proportional to 1,963.40, 2,946.54 and 990.20 is: 1,486.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,963.40 : 2,946.54 = 990.20 : x
  2. Step 2: Convert to fraction form
    1,963.40/2,946.54 = 990.20/x
  3. Step 3: Cross multiply
    1,963.40x = 2,946.54 × 990.20
  4. Step 4: Simplify right side
    1,963.40x = 2,917,663.91
  5. Step 5: Solve for x
    x = 2,917,663.91/1,963.40
  6. Step 6: Final answer
    x = 1,486.03

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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.