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Finding the Fourth Proportional to 1,653.75, 2,282.10 and 990.47

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Solution

The fourth proportional to 1,653.75, 2,282.10 and 990.47 is: 1,366.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.75 : 2,282.10 = 990.47 : x
  2. Step 2: Convert to fraction form
    1,653.75/2,282.10 = 990.47/x
  3. Step 3: Cross multiply
    1,653.75x = 2,282.10 × 990.47
  4. Step 4: Simplify right side
    1,653.75x = 2,260,353.58
  5. Step 5: Solve for x
    x = 2,260,353.58/1,653.75
  6. Step 6: Final answer
    x = 1,366.80

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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.