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Finding the Fourth Proportional to 956.40, 1,434.60 and 946.80

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Solution

The fourth proportional to 956.40, 1,434.60 and 946.80 is: 1,420.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.40 : 1,434.60 = 946.80 : x
  2. Step 2: Convert to fraction form
    956.40/1,434.60 = 946.80/x
  3. Step 3: Cross multiply
    956.40x = 1,434.60 × 946.80
  4. Step 4: Simplify right side
    956.40x = 1,358,279.28
  5. Step 5: Solve for x
    x = 1,358,279.28/956.40
  6. Step 6: Final answer
    x = 1,420.20

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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.