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Finding the Fourth Proportional to 923.72, 1,385.78 and 436.50

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Solution

The fourth proportional to 923.72, 1,385.78 and 436.50 is: 654.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.72 : 1,385.78 = 436.50 : x
  2. Step 2: Convert to fraction form
    923.72/1,385.78 = 436.50/x
  3. Step 3: Cross multiply
    923.72x = 1,385.78 × 436.50
  4. Step 4: Simplify right side
    923.72x = 604,890.79
  5. Step 5: Solve for x
    x = 604,890.79/923.72
  6. Step 6: Final answer
    x = 654.85

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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.