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Finding the Fourth Proportional to 1,009.77, 1,513.79 and 393.90

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Solution

The fourth proportional to 1,009.77, 1,513.79 and 393.90 is: 590.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.77 : 1,513.79 = 393.90 : x
  2. Step 2: Convert to fraction form
    1,009.77/1,513.79 = 393.90/x
  3. Step 3: Cross multiply
    1,009.77x = 1,513.79 × 393.90
  4. Step 4: Simplify right side
    1,009.77x = 596,281.88
  5. Step 5: Solve for x
    x = 596,281.88/1,009.77
  6. Step 6: Final answer
    x = 590.51

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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.