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Finding the Fourth Proportional to 751.55, 1,129.37 and 405.14

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Solution

The fourth proportional to 751.55, 1,129.37 and 405.14 is: 608.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.55 : 1,129.37 = 405.14 : x
  2. Step 2: Convert to fraction form
    751.55/1,129.37 = 405.14/x
  3. Step 3: Cross multiply
    751.55x = 1,129.37 × 405.14
  4. Step 4: Simplify right side
    751.55x = 457,545.29
  5. Step 5: Solve for x
    x = 457,545.29/751.55
  6. Step 6: Final answer
    x = 608.81

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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.