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Finding the Fourth Proportional to 653.58, 986.61 and 649.94

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Solution

The fourth proportional to 653.58, 986.61 and 649.94 is: 981.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.58 : 986.61 = 649.94 : x
  2. Step 2: Convert to fraction form
    653.58/986.61 = 649.94/x
  3. Step 3: Cross multiply
    653.58x = 986.61 × 649.94
  4. Step 4: Simplify right side
    653.58x = 641,232.37
  5. Step 5: Solve for x
    x = 641,232.37/653.58
  6. Step 6: Final answer
    x = 981.11

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.