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Finding the Fourth Proportional to 476, 656.40 and 388.40

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Solution

The fourth proportional to 476, 656.40 and 388.40 is: 535.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    476 : 656.40 = 388.40 : x
  2. Step 2: Convert to fraction form
    476/656.40 = 388.40/x
  3. Step 3: Cross multiply
    476x = 656.40 × 388.40
  4. Step 4: Simplify right side
    476x = 254,945.76
  5. Step 5: Solve for x
    x = 254,945.76/476
  6. Step 6: Final answer
    x = 535.60

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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.