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Finding the Fourth Proportional to 923.19, 1,383.77 and 649.21

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Solution

The fourth proportional to 923.19, 1,383.77 and 649.21 is: 973.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.19 : 1,383.77 = 649.21 : x
  2. Step 2: Convert to fraction form
    923.19/1,383.77 = 649.21/x
  3. Step 3: Cross multiply
    923.19x = 1,383.77 × 649.21
  4. Step 4: Simplify right side
    923.19x = 898,357.32
  5. Step 5: Solve for x
    x = 898,357.32/923.19
  6. Step 6: Final answer
    x = 973.10

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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.