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Finding the Fourth Proportional to 910.55, 1,365.81 and 390.11

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Solution

The fourth proportional to 910.55, 1,365.81 and 390.11 is: 585.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.55 : 1,365.81 = 390.11 : x
  2. Step 2: Convert to fraction form
    910.55/1,365.81 = 390.11/x
  3. Step 3: Cross multiply
    910.55x = 1,365.81 × 390.11
  4. Step 4: Simplify right side
    910.55x = 532,819.55
  5. Step 5: Solve for x
    x = 532,819.55/910.55
  6. Step 6: Final answer
    x = 585.16

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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.