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Finding the Fourth Proportional to 469.90, 705.66 and 388.90

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Solution

The fourth proportional to 469.90, 705.66 and 388.90 is: 584.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.90 : 705.66 = 388.90 : x
  2. Step 2: Convert to fraction form
    469.90/705.66 = 388.90/x
  3. Step 3: Cross multiply
    469.90x = 705.66 × 388.90
  4. Step 4: Simplify right side
    469.90x = 274,431.17
  5. Step 5: Solve for x
    x = 274,431.17/469.90
  6. Step 6: Final answer
    x = 584.02

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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.