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Finding the Fourth Proportional to 476.40, 714.60 and 436.80

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Solution

The fourth proportional to 476.40, 714.60 and 436.80 is: 655.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.40 : 714.60 = 436.80 : x
  2. Step 2: Convert to fraction form
    476.40/714.60 = 436.80/x
  3. Step 3: Cross multiply
    476.40x = 714.60 × 436.80
  4. Step 4: Simplify right side
    476.40x = 312,137.28
  5. Step 5: Solve for x
    x = 312,137.28/476.40
  6. Step 6: Final answer
    x = 655.20

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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.