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Finding the Fourth Proportional to 1,590.78, 2,385.34 and 666.17

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Solution

The fourth proportional to 1,590.78, 2,385.34 and 666.17 is: 998.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.78 : 2,385.34 = 666.17 : x
  2. Step 2: Convert to fraction form
    1,590.78/2,385.34 = 666.17/x
  3. Step 3: Cross multiply
    1,590.78x = 2,385.34 × 666.17
  4. Step 4: Simplify right side
    1,590.78x = 1,589,041.95
  5. Step 5: Solve for x
    x = 1,589,041.95/1,590.78
  6. Step 6: Final answer
    x = 998.91

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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.