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Finding the Fourth Proportional to 954.21, 1,431.45 and 434.21

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Solution

The fourth proportional to 954.21, 1,431.45 and 434.21 is: 651.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.21 : 1,431.45 = 434.21 : x
  2. Step 2: Convert to fraction form
    954.21/1,431.45 = 434.21/x
  3. Step 3: Cross multiply
    954.21x = 1,431.45 × 434.21
  4. Step 4: Simplify right side
    954.21x = 621,549.90
  5. Step 5: Solve for x
    x = 621,549.90/954.21
  6. Step 6: Final answer
    x = 651.38

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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.