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Finding the Fourth Proportional to 1,061.26, 1,590.45 and 788.38

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Solution

The fourth proportional to 1,061.26, 1,590.45 and 788.38 is: 1,181.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,061.26 : 1,590.45 = 788.38 : x
  2. Step 2: Convert to fraction form
    1,061.26/1,590.45 = 788.38/x
  3. Step 3: Cross multiply
    1,061.26x = 1,590.45 × 788.38
  4. Step 4: Simplify right side
    1,061.26x = 1,253,878.97
  5. Step 5: Solve for x
    x = 1,253,878.97/1,061.26
  6. Step 6: Final answer
    x = 1,181.50

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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.