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Finding the Fourth Proportional to 554.18, 830.60 and 261.50

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Solution

The fourth proportional to 554.18, 830.60 and 261.50 is: 391.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.18 : 830.60 = 261.50 : x
  2. Step 2: Convert to fraction form
    554.18/830.60 = 261.50/x
  3. Step 3: Cross multiply
    554.18x = 830.60 × 261.50
  4. Step 4: Simplify right side
    554.18x = 217,200.59
  5. Step 5: Solve for x
    x = 217,200.59/554.18
  6. Step 6: Final answer
    x = 391.93

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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.