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Finding the Fourth Proportional to 990.60, 1,367.70 and 885.35

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Solution

The fourth proportional to 990.60, 1,367.70 and 885.35 is: 1,222.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.60 : 1,367.70 = 885.35 : x
  2. Step 2: Convert to fraction form
    990.60/1,367.70 = 885.35/x
  3. Step 3: Cross multiply
    990.60x = 1,367.70 × 885.35
  4. Step 4: Simplify right side
    990.60x = 1,210,893.29
  5. Step 5: Solve for x
    x = 1,210,893.29/990.60
  6. Step 6: Final answer
    x = 1,222.38

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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.