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Finding the Fourth Proportional to 585.76, 876.70 and 420.80

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Solution

The fourth proportional to 585.76, 876.70 and 420.80 is: 629.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    585.76 : 876.70 = 420.80 : x
  2. Step 2: Convert to fraction form
    585.76/876.70 = 420.80/x
  3. Step 3: Cross multiply
    585.76x = 876.70 × 420.80
  4. Step 4: Simplify right side
    585.76x = 368,915.36
  5. Step 5: Solve for x
    x = 368,915.36/585.76
  6. Step 6: Final answer
    x = 629.81

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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.