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Finding the Fourth Proportional to 923.55, 1,385.70 and 403.65

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Solution

The fourth proportional to 923.55, 1,385.70 and 403.65 is: 605.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.55 : 1,385.70 = 403.65 : x
  2. Step 2: Convert to fraction form
    923.55/1,385.70 = 403.65/x
  3. Step 3: Cross multiply
    923.55x = 1,385.70 × 403.65
  4. Step 4: Simplify right side
    923.55x = 559,337.81
  5. Step 5: Solve for x
    x = 559,337.81/923.55
  6. Step 6: Final answer
    x = 605.64

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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.