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Finding the Fourth Proportional to 954.39, 1,431.65 and 406.57

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Solution

The fourth proportional to 954.39, 1,431.65 and 406.57 is: 609.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.39 : 1,431.65 = 406.57 : x
  2. Step 2: Convert to fraction form
    954.39/1,431.65 = 406.57/x
  3. Step 3: Cross multiply
    954.39x = 1,431.65 × 406.57
  4. Step 4: Simplify right side
    954.39x = 582,070.66
  5. Step 5: Solve for x
    x = 582,070.66/954.39
  6. Step 6: Final answer
    x = 609.89

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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.