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Finding the Fourth Proportional to 949.10, 1,423.80 and 429.10

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Solution

The fourth proportional to 949.10, 1,423.80 and 429.10 is: 643.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.10 : 1,423.80 = 429.10 : x
  2. Step 2: Convert to fraction form
    949.10/1,423.80 = 429.10/x
  3. Step 3: Cross multiply
    949.10x = 1,423.80 × 429.10
  4. Step 4: Simplify right side
    949.10x = 610,949.02
  5. Step 5: Solve for x
    x = 610,949.02/949.10
  6. Step 6: Final answer
    x = 643.72

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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.