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Finding the Fourth Proportional to 653.64, 902.07 and 388.17

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Solution

The fourth proportional to 653.64, 902.07 and 388.17 is: 535.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.64 : 902.07 = 388.17 : x
  2. Step 2: Convert to fraction form
    653.64/902.07 = 388.17/x
  3. Step 3: Cross multiply
    653.64x = 902.07 × 388.17
  4. Step 4: Simplify right side
    653.64x = 350,156.51
  5. Step 5: Solve for x
    x = 350,156.51/653.64
  6. Step 6: Final answer
    x = 535.70

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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.