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Finding the Fourth Proportional to 990.84, 1,358.46 and 973.28

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Solution

The fourth proportional to 990.84, 1,358.46 and 973.28 is: 1,334.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.84 : 1,358.46 = 973.28 : x
  2. Step 2: Convert to fraction form
    990.84/1,358.46 = 973.28/x
  3. Step 3: Cross multiply
    990.84x = 1,358.46 × 973.28
  4. Step 4: Simplify right side
    990.84x = 1,322,161.95
  5. Step 5: Solve for x
    x = 1,322,161.95/990.84
  6. Step 6: Final answer
    x = 1,334.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.