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Finding the Fourth Proportional to 954.78, 1,431.55 and 406.51

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Solution

The fourth proportional to 954.78, 1,431.55 and 406.51 is: 609.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.78 : 1,431.55 = 406.51 : x
  2. Step 2: Convert to fraction form
    954.78/1,431.55 = 406.51/x
  3. Step 3: Cross multiply
    954.78x = 1,431.55 × 406.51
  4. Step 4: Simplify right side
    954.78x = 581,939.39
  5. Step 5: Solve for x
    x = 581,939.39/954.78
  6. Step 6: Final answer
    x = 609.50

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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.