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Finding the Fourth Proportional to 1,990.47, 2,985.71 and 965.19

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Solution

The fourth proportional to 1,990.47, 2,985.71 and 965.19 is: 1,447.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.47 : 2,985.71 = 965.19 : x
  2. Step 2: Convert to fraction form
    1,990.47/2,985.71 = 965.19/x
  3. Step 3: Cross multiply
    1,990.47x = 2,985.71 × 965.19
  4. Step 4: Simplify right side
    1,990.47x = 2,881,772.61
  5. Step 5: Solve for x
    x = 2,881,772.61/1,990.47
  6. Step 6: Final answer
    x = 1,447.79

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Similar ratio
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1.5x scale

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.