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Finding the Fourth Proportional to 989.10, 1,364.92 and 616.21

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Solution

The fourth proportional to 989.10, 1,364.92 and 616.21 is: 850.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.10 : 1,364.92 = 616.21 : x
  2. Step 2: Convert to fraction form
    989.10/1,364.92 = 616.21/x
  3. Step 3: Cross multiply
    989.10x = 1,364.92 × 616.21
  4. Step 4: Simplify right side
    989.10x = 841,072.40
  5. Step 5: Solve for x
    x = 841,072.40/989.10
  6. Step 6: Final answer
    x = 850.34

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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.