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Finding the Fourth Proportional to 904, 1,247.10 and 642.16

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Solution

The fourth proportional to 904, 1,247.10 and 642.16 is: 885.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    904 : 1,247.10 = 642.16 : x
  2. Step 2: Convert to fraction form
    904/1,247.10 = 642.16/x
  3. Step 3: Cross multiply
    904x = 1,247.10 × 642.16
  4. Step 4: Simplify right side
    904x = 800,837.74
  5. Step 5: Solve for x
    x = 800,837.74/904
  6. Step 6: Final answer
    x = 885.88

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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.