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Finding the Fourth Proportional to 931.98, 1,398.88 and 347.57

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Solution

The fourth proportional to 931.98, 1,398.88 and 347.57 is: 521.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.98 : 1,398.88 = 347.57 : x
  2. Step 2: Convert to fraction form
    931.98/1,398.88 = 347.57/x
  3. Step 3: Cross multiply
    931.98x = 1,398.88 × 347.57
  4. Step 4: Simplify right side
    931.98x = 486,208.72
  5. Step 5: Solve for x
    x = 486,208.72/931.98
  6. Step 6: Final answer
    x = 521.69

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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.