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Finding the Fourth Proportional to 1,112.78, 1,670.60 and 907.74

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Solution

The fourth proportional to 1,112.78, 1,670.60 and 907.74 is: 1,362.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.78 : 1,670.60 = 907.74 : x
  2. Step 2: Convert to fraction form
    1,112.78/1,670.60 = 907.74/x
  3. Step 3: Cross multiply
    1,112.78x = 1,670.60 × 907.74
  4. Step 4: Simplify right side
    1,112.78x = 1,516,470.44
  5. Step 5: Solve for x
    x = 1,516,470.44/1,112.78
  6. Step 6: Final answer
    x = 1,362.78

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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.