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Finding the Fourth Proportional to 991.47, 1,367.40 and 637.45

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Solution

The fourth proportional to 991.47, 1,367.40 and 637.45 is: 879.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.47 : 1,367.40 = 637.45 : x
  2. Step 2: Convert to fraction form
    991.47/1,367.40 = 637.45/x
  3. Step 3: Cross multiply
    991.47x = 1,367.40 × 637.45
  4. Step 4: Simplify right side
    991.47x = 871,649.13
  5. Step 5: Solve for x
    x = 871,649.13/991.47
  6. Step 6: Final answer
    x = 879.15

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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.