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Finding the Fourth Proportional to 926.90, 1,388.50 and 487.48

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Solution

The fourth proportional to 926.90, 1,388.50 and 487.48 is: 730.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.90 : 1,388.50 = 487.48 : x
  2. Step 2: Convert to fraction form
    926.90/1,388.50 = 487.48/x
  3. Step 3: Cross multiply
    926.90x = 1,388.50 × 487.48
  4. Step 4: Simplify right side
    926.90x = 676,865.98
  5. Step 5: Solve for x
    x = 676,865.98/926.90
  6. Step 6: Final answer
    x = 730.25

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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.