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Finding the Fourth Proportional to 1,429.78, 1,972.85 and 840.44

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Solution

The fourth proportional to 1,429.78, 1,972.85 and 840.44 is: 1,159.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,429.78 : 1,972.85 = 840.44 : x
  2. Step 2: Convert to fraction form
    1,429.78/1,972.85 = 840.44/x
  3. Step 3: Cross multiply
    1,429.78x = 1,972.85 × 840.44
  4. Step 4: Simplify right side
    1,429.78x = 1,658,047.99
  5. Step 5: Solve for x
    x = 1,658,047.99/1,429.78
  6. Step 6: Final answer
    x = 1,159.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.