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Finding the Fourth Proportional to 910.40, 1,362.72 and 649.56

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Solution

The fourth proportional to 910.40, 1,362.72 and 649.56 is: 972.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.40 : 1,362.72 = 649.56 : x
  2. Step 2: Convert to fraction form
    910.40/1,362.72 = 649.56/x
  3. Step 3: Cross multiply
    910.40x = 1,362.72 × 649.56
  4. Step 4: Simplify right side
    910.40x = 885,168.40
  5. Step 5: Solve for x
    x = 885,168.40/910.40
  6. Step 6: Final answer
    x = 972.29

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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.