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Finding the Fourth Proportional to 1,284.60, 1,772.76 and 989.34

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Solution

The fourth proportional to 1,284.60, 1,772.76 and 989.34 is: 1,365.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.60 : 1,772.76 = 989.34 : x
  2. Step 2: Convert to fraction form
    1,284.60/1,772.76 = 989.34/x
  3. Step 3: Cross multiply
    1,284.60x = 1,772.76 × 989.34
  4. Step 4: Simplify right side
    1,284.60x = 1,753,862.38
  5. Step 5: Solve for x
    x = 1,753,862.38/1,284.60
  6. Step 6: Final answer
    x = 1,365.30

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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.