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Finding the Fourth Proportional to 1,009.78, 1,513.90 and 393.92

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Solution

The fourth proportional to 1,009.78, 1,513.90 and 393.92 is: 590.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.78 : 1,513.90 = 393.92 : x
  2. Step 2: Convert to fraction form
    1,009.78/1,513.90 = 393.92/x
  3. Step 3: Cross multiply
    1,009.78x = 1,513.90 × 393.92
  4. Step 4: Simplify right side
    1,009.78x = 596,349.67
  5. Step 5: Solve for x
    x = 596,349.67/1,009.78
  6. Step 6: Final answer
    x = 590.57

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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.