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Finding the Fourth Proportional to 926.35, 1,387.33 and 486.55

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Solution

The fourth proportional to 926.35, 1,387.33 and 486.55 is: 728.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.35 : 1,387.33 = 486.55 : x
  2. Step 2: Convert to fraction form
    926.35/1,387.33 = 486.55/x
  3. Step 3: Cross multiply
    926.35x = 1,387.33 × 486.55
  4. Step 4: Simplify right side
    926.35x = 675,005.41
  5. Step 5: Solve for x
    x = 675,005.41/926.35
  6. Step 6: Final answer
    x = 728.67

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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.