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Finding the Fourth Proportional to 953.56, 1,429.62 and 390.43

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Solution

The fourth proportional to 953.56, 1,429.62 and 390.43 is: 585.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.56 : 1,429.62 = 390.43 : x
  2. Step 2: Convert to fraction form
    953.56/1,429.62 = 390.43/x
  3. Step 3: Cross multiply
    953.56x = 1,429.62 × 390.43
  4. Step 4: Simplify right side
    953.56x = 558,166.54
  5. Step 5: Solve for x
    x = 558,166.54/953.56
  6. Step 6: Final answer
    x = 585.35

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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.