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Finding the Fourth Proportional to 1,590.36, 2,385.81 and 665.88

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Solution

The fourth proportional to 1,590.36, 2,385.81 and 665.88 is: 998.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,590.36 : 2,385.81 = 665.88 : x
  2. Step 2: Convert to fraction form
    1,590.36/2,385.81 = 665.88/x
  3. Step 3: Cross multiply
    1,590.36x = 2,385.81 × 665.88
  4. Step 4: Simplify right side
    1,590.36x = 1,588,663.16
  5. Step 5: Solve for x
    x = 1,588,663.16/1,590.36
  6. Step 6: Final answer
    x = 998.93

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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.