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Finding the Fourth Proportional to 1,590.12, 2,385.79 and 768.32

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Solution

The fourth proportional to 1,590.12, 2,385.79 and 768.32 is: 1,152.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.12 : 2,385.79 = 768.32 : x
  2. Step 2: Convert to fraction form
    1,590.12/2,385.79 = 768.32/x
  3. Step 3: Cross multiply
    1,590.12x = 2,385.79 × 768.32
  4. Step 4: Simplify right side
    1,590.12x = 1,833,058.69
  5. Step 5: Solve for x
    x = 1,833,058.69/1,590.12
  6. Step 6: Final answer
    x = 1,152.78

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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.