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Finding the Fourth Proportional to 1,061.80, 1,590.30 and 629.80

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Solution

The fourth proportional to 1,061.80, 1,590.30 and 629.80 is: 943.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.80 : 1,590.30 = 629.80 : x
  2. Step 2: Convert to fraction form
    1,061.80/1,590.30 = 629.80/x
  3. Step 3: Cross multiply
    1,061.80x = 1,590.30 × 629.80
  4. Step 4: Simplify right side
    1,061.80x = 1,001,570.94
  5. Step 5: Solve for x
    x = 1,001,570.94/1,061.80
  6. Step 6: Final answer
    x = 943.28

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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.