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Finding the Fourth Proportional to 1,112.45, 1,666.40 and 624.47

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Solution

The fourth proportional to 1,112.45, 1,666.40 and 624.47 is: 935.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.45 : 1,666.40 = 624.47 : x
  2. Step 2: Convert to fraction form
    1,112.45/1,666.40 = 624.47/x
  3. Step 3: Cross multiply
    1,112.45x = 1,666.40 × 624.47
  4. Step 4: Simplify right side
    1,112.45x = 1,040,616.81
  5. Step 5: Solve for x
    x = 1,040,616.81/1,112.45
  6. Step 6: Final answer
    x = 935.43

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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.