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Finding the Fourth Proportional to 771.48, 1,155.12 and 405.48

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Solution

The fourth proportional to 771.48, 1,155.12 and 405.48 is: 607.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.48 : 1,155.12 = 405.48 : x
  2. Step 2: Convert to fraction form
    771.48/1,155.12 = 405.48/x
  3. Step 3: Cross multiply
    771.48x = 1,155.12 × 405.48
  4. Step 4: Simplify right side
    771.48x = 468,378.06
  5. Step 5: Solve for x
    x = 468,378.06/771.48
  6. Step 6: Final answer
    x = 607.12

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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.