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Finding the Fourth Proportional to 923.36, 1,385.45 and 436.28

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Solution

The fourth proportional to 923.36, 1,385.45 and 436.28 is: 654.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.36 : 1,385.45 = 436.28 : x
  2. Step 2: Convert to fraction form
    923.36/1,385.45 = 436.28/x
  3. Step 3: Cross multiply
    923.36x = 1,385.45 × 436.28
  4. Step 4: Simplify right side
    923.36x = 604,441.94
  5. Step 5: Solve for x
    x = 604,441.94/923.36
  6. Step 6: Final answer
    x = 654.61

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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.