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Finding the Fourth Proportional to 900.76, 1,347.77 and 641.36

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Solution

The fourth proportional to 900.76, 1,347.77 and 641.36 is: 959.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.76 : 1,347.77 = 641.36 : x
  2. Step 2: Convert to fraction form
    900.76/1,347.77 = 641.36/x
  3. Step 3: Cross multiply
    900.76x = 1,347.77 × 641.36
  4. Step 4: Simplify right side
    900.76x = 864,405.77
  5. Step 5: Solve for x
    x = 864,405.77/900.76
  6. Step 6: Final answer
    x = 959.64

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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.