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Finding the Fourth Proportional to 486.18, 670.59 and 388.17

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Solution

The fourth proportional to 486.18, 670.59 and 388.17 is: 535.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.18 : 670.59 = 388.17 : x
  2. Step 2: Convert to fraction form
    486.18/670.59 = 388.17/x
  3. Step 3: Cross multiply
    486.18x = 670.59 × 388.17
  4. Step 4: Simplify right side
    486.18x = 260,302.92
  5. Step 5: Solve for x
    x = 260,302.92/486.18
  6. Step 6: Final answer
    x = 535.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.