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Finding the Fourth Proportional to 1,013.02, 1,518.40 and 427.86

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Solution

The fourth proportional to 1,013.02, 1,518.40 and 427.86 is: 641.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.02 : 1,518.40 = 427.86 : x
  2. Step 2: Convert to fraction form
    1,013.02/1,518.40 = 427.86/x
  3. Step 3: Cross multiply
    1,013.02x = 1,518.40 × 427.86
  4. Step 4: Simplify right side
    1,013.02x = 649,662.62
  5. Step 5: Solve for x
    x = 649,662.62/1,013.02
  6. Step 6: Final answer
    x = 641.31

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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.