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Finding the Fourth Proportional to 812.47, 1,120.48 and 637.51

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Solution

The fourth proportional to 812.47, 1,120.48 and 637.51 is: 879.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.47 : 1,120.48 = 637.51 : x
  2. Step 2: Convert to fraction form
    812.47/1,120.48 = 637.51/x
  3. Step 3: Cross multiply
    812.47x = 1,120.48 × 637.51
  4. Step 4: Simplify right side
    812.47x = 714,317.20
  5. Step 5: Solve for x
    x = 714,317.20/812.47
  6. Step 6: Final answer
    x = 879.19

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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.