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Finding the Fourth Proportional to 930.55, 1,395.30 and 409.93

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Solution

The fourth proportional to 930.55, 1,395.30 and 409.93 is: 614.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.55 : 1,395.30 = 409.93 : x
  2. Step 2: Convert to fraction form
    930.55/1,395.30 = 409.93/x
  3. Step 3: Cross multiply
    930.55x = 1,395.30 × 409.93
  4. Step 4: Simplify right side
    930.55x = 571,975.33
  5. Step 5: Solve for x
    x = 571,975.33/930.55
  6. Step 6: Final answer
    x = 614.66

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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.