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Finding the Fourth Proportional to 476.78, 713.69 and 436.40

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Solution

The fourth proportional to 476.78, 713.69 and 436.40 is: 653.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.78 : 713.69 = 436.40 : x
  2. Step 2: Convert to fraction form
    476.78/713.69 = 436.40/x
  3. Step 3: Cross multiply
    476.78x = 713.69 × 436.40
  4. Step 4: Simplify right side
    476.78x = 311,455.67
  5. Step 5: Solve for x
    x = 311,455.67/476.78
  6. Step 6: Final answer
    x = 653.25

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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.