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Finding the Fourth Proportional to 923.55, 1,385.43 and 403.61

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Solution

The fourth proportional to 923.55, 1,385.43 and 403.61 is: 605.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.55 : 1,385.43 = 403.61 : x
  2. Step 2: Convert to fraction form
    923.55/1,385.43 = 403.61/x
  3. Step 3: Cross multiply
    923.55x = 1,385.43 × 403.61
  4. Step 4: Simplify right side
    923.55x = 559,166.48
  5. Step 5: Solve for x
    x = 559,166.48/923.55
  6. Step 6: Final answer
    x = 605.45

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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.