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Finding the Fourth Proportional to 866.65, 1,300.40 and 379.63

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Solution

The fourth proportional to 866.65, 1,300.40 and 379.63 is: 569.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.65 : 1,300.40 = 379.63 : x
  2. Step 2: Convert to fraction form
    866.65/1,300.40 = 379.63/x
  3. Step 3: Cross multiply
    866.65x = 1,300.40 × 379.63
  4. Step 4: Simplify right side
    866.65x = 493,670.85
  5. Step 5: Solve for x
    x = 493,670.85/866.65
  6. Step 6: Final answer
    x = 569.63

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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.