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Finding the Fourth Proportional to 1,190.03, 1,785.04 and 642.47

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Solution

The fourth proportional to 1,190.03, 1,785.04 and 642.47 is: 963.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.03 : 1,785.04 = 642.47 : x
  2. Step 2: Convert to fraction form
    1,190.03/1,785.04 = 642.47/x
  3. Step 3: Cross multiply
    1,190.03x = 1,785.04 × 642.47
  4. Step 4: Simplify right side
    1,190.03x = 1,146,825.72
  5. Step 5: Solve for x
    x = 1,146,825.72/1,190.03
  6. Step 6: Final answer
    x = 963.70

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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.