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Finding the Fourth Proportional to 910.59, 1,365.38 and 285.71

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Solution

The fourth proportional to 910.59, 1,365.38 and 285.71 is: 428.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.59 : 1,365.38 = 285.71 : x
  2. Step 2: Convert to fraction form
    910.59/1,365.38 = 285.71/x
  3. Step 3: Cross multiply
    910.59x = 1,365.38 × 285.71
  4. Step 4: Simplify right side
    910.59x = 390,102.72
  5. Step 5: Solve for x
    x = 390,102.72/910.59
  6. Step 6: Final answer
    x = 428.41

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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.