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Finding the Fourth Proportional to 1,653.25, 2,281.49 and 990.21

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Solution

The fourth proportional to 1,653.25, 2,281.49 and 990.21 is: 1,366.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.25 : 2,281.49 = 990.21 : x
  2. Step 2: Convert to fraction form
    1,653.25/2,281.49 = 990.21/x
  3. Step 3: Cross multiply
    1,653.25x = 2,281.49 × 990.21
  4. Step 4: Simplify right side
    1,653.25x = 2,259,154.21
  5. Step 5: Solve for x
    x = 2,259,154.21/1,653.25
  6. Step 6: Final answer
    x = 1,366.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.