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Finding the Fourth Proportional to 1,153.40, 1,730.09 and 423.18

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Solution

The fourth proportional to 1,153.40, 1,730.09 and 423.18 is: 634.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.40 : 1,730.09 = 423.18 : x
  2. Step 2: Convert to fraction form
    1,153.40/1,730.09 = 423.18/x
  3. Step 3: Cross multiply
    1,153.40x = 1,730.09 × 423.18
  4. Step 4: Simplify right side
    1,153.40x = 732,137.37
  5. Step 5: Solve for x
    x = 732,137.37/1,153.40
  6. Step 6: Final answer
    x = 634.77

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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.