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Finding the Fourth Proportional to 473.52, 653.78 and 386.40

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Solution

The fourth proportional to 473.52, 653.78 and 386.40 is: 533.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    473.52 : 653.78 = 386.40 : x
  2. Step 2: Convert to fraction form
    473.52/653.78 = 386.40/x
  3. Step 3: Cross multiply
    473.52x = 653.78 × 386.40
  4. Step 4: Simplify right side
    473.52x = 252,620.59
  5. Step 5: Solve for x
    x = 252,620.59/473.52
  6. Step 6: Final answer
    x = 533.50

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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.