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Finding the Fourth Proportional to 1,112.70, 1,535.69 and 670.90

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Solution

The fourth proportional to 1,112.70, 1,535.69 and 670.90 is: 925.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.70 : 1,535.69 = 670.90 : x
  2. Step 2: Convert to fraction form
    1,112.70/1,535.69 = 670.90/x
  3. Step 3: Cross multiply
    1,112.70x = 1,535.69 × 670.90
  4. Step 4: Simplify right side
    1,112.70x = 1,030,292.26
  5. Step 5: Solve for x
    x = 1,030,292.26/1,112.70
  6. Step 6: Final answer
    x = 925.94

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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.