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Finding the Fourth Proportional to 956.21, 1,434.18 and 339.86

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Solution

The fourth proportional to 956.21, 1,434.18 and 339.86 is: 509.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.21 : 1,434.18 = 339.86 : x
  2. Step 2: Convert to fraction form
    956.21/1,434.18 = 339.86/x
  3. Step 3: Cross multiply
    956.21x = 1,434.18 × 339.86
  4. Step 4: Simplify right side
    956.21x = 487,420.41
  5. Step 5: Solve for x
    x = 487,420.41/956.21
  6. Step 6: Final answer
    x = 509.74

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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.