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Finding the Fourth Proportional to 405.48, 607.54 and 261.12

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Solution

The fourth proportional to 405.48, 607.54 and 261.12 is: 391.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.48 : 607.54 = 261.12 : x
  2. Step 2: Convert to fraction form
    405.48/607.54 = 261.12/x
  3. Step 3: Cross multiply
    405.48x = 607.54 × 261.12
  4. Step 4: Simplify right side
    405.48x = 158,640.84
  5. Step 5: Solve for x
    x = 158,640.84/405.48
  6. Step 6: Final answer
    x = 391.24

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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.