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Finding the Fourth Proportional to 931.21, 1,284.97 and 553.05

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Solution

The fourth proportional to 931.21, 1,284.97 and 553.05 is: 763.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.21 : 1,284.97 = 553.05 : x
  2. Step 2: Convert to fraction form
    931.21/1,284.97 = 553.05/x
  3. Step 3: Cross multiply
    931.21x = 1,284.97 × 553.05
  4. Step 4: Simplify right side
    931.21x = 710,652.66
  5. Step 5: Solve for x
    x = 710,652.66/931.21
  6. Step 6: Final answer
    x = 763.15

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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.