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Finding the Fourth Proportional to 923.76, 1,385.16 and 436.68

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Solution

The fourth proportional to 923.76, 1,385.16 and 436.68 is: 654.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.76 : 1,385.16 = 436.68 : x
  2. Step 2: Convert to fraction form
    923.76/1,385.16 = 436.68/x
  3. Step 3: Cross multiply
    923.76x = 1,385.16 × 436.68
  4. Step 4: Simplify right side
    923.76x = 604,871.67
  5. Step 5: Solve for x
    x = 604,871.67/923.76
  6. Step 6: Final answer
    x = 654.79

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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.