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Finding the Fourth Proportional to 911.47, 1,366.06 and 390.86

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Solution

The fourth proportional to 911.47, 1,366.06 and 390.86 is: 585.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.47 : 1,366.06 = 390.86 : x
  2. Step 2: Convert to fraction form
    911.47/1,366.06 = 390.86/x
  3. Step 3: Cross multiply
    911.47x = 1,366.06 × 390.86
  4. Step 4: Simplify right side
    911.47x = 533,938.21
  5. Step 5: Solve for x
    x = 533,938.21/911.47
  6. Step 6: Final answer
    x = 585.80

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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.