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Finding the Fourth Proportional to 931.04, 1,284.78 and 538.03

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Solution

The fourth proportional to 931.04, 1,284.78 and 538.03 is: 742.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.04 : 1,284.78 = 538.03 : x
  2. Step 2: Convert to fraction form
    931.04/1,284.78 = 538.03/x
  3. Step 3: Cross multiply
    931.04x = 1,284.78 × 538.03
  4. Step 4: Simplify right side
    931.04x = 691,249.77
  5. Step 5: Solve for x
    x = 691,249.77/931.04
  6. Step 6: Final answer
    x = 742.45

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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.