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Finding the Fourth Proportional to 910.35, 1,365.62 and 390.41

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Solution

The fourth proportional to 910.35, 1,365.62 and 390.41 is: 585.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.35 : 1,365.62 = 390.41 : x
  2. Step 2: Convert to fraction form
    910.35/1,365.62 = 390.41/x
  3. Step 3: Cross multiply
    910.35x = 1,365.62 × 390.41
  4. Step 4: Simplify right side
    910.35x = 533,151.70
  5. Step 5: Solve for x
    x = 533,151.70/910.35
  6. Step 6: Final answer
    x = 585.66

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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.