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Finding the Fourth Proportional to 1,039.70, 1,560.50 and 423.83

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Solution

The fourth proportional to 1,039.70, 1,560.50 and 423.83 is: 636.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.70 : 1,560.50 = 423.83 : x
  2. Step 2: Convert to fraction form
    1,039.70/1,560.50 = 423.83/x
  3. Step 3: Cross multiply
    1,039.70x = 1,560.50 × 423.83
  4. Step 4: Simplify right side
    1,039.70x = 661,386.72
  5. Step 5: Solve for x
    x = 661,386.72/1,039.70
  6. Step 6: Final answer
    x = 636.13

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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.