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Finding the Fourth Proportional to 568.64, 783.84 and 420.80

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Solution

The fourth proportional to 568.64, 783.84 and 420.80 is: 580.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    568.64 : 783.84 = 420.80 : x
  2. Step 2: Convert to fraction form
    568.64/783.84 = 420.80/x
  3. Step 3: Cross multiply
    568.64x = 783.84 × 420.80
  4. Step 4: Simplify right side
    568.64x = 329,839.87
  5. Step 5: Solve for x
    x = 329,839.87/568.64
  6. Step 6: Final answer
    x = 580.05

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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.