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Finding the Fourth Proportional to 926.90, 1,390.40 and 379.16

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Solution

The fourth proportional to 926.90, 1,390.40 and 379.16 is: 568.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,390.40 = 379.16 : x
  2. Step 2: Convert to fraction form
    926.90/1,390.40 = 379.16/x
  3. Step 3: Cross multiply
    926.90x = 1,390.40 × 379.16
  4. Step 4: Simplify right side
    926.90x = 527,175.22
  5. Step 5: Solve for x
    x = 527,175.22/926.90
  6. Step 6: Final answer
    x = 568.75

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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.