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Finding the Fourth Proportional to 954.36, 1,431.38 and 434.28

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Solution

The fourth proportional to 954.36, 1,431.38 and 434.28 is: 651.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.36 : 1,431.38 = 434.28 : x
  2. Step 2: Convert to fraction form
    954.36/1,431.38 = 434.28/x
  3. Step 3: Cross multiply
    954.36x = 1,431.38 × 434.28
  4. Step 4: Simplify right side
    954.36x = 621,619.71
  5. Step 5: Solve for x
    x = 621,619.71/954.36
  6. Step 6: Final answer
    x = 651.35

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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.