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Finding the Fourth Proportional to 554.30, 830.54 and 391.64

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Solution

The fourth proportional to 554.30, 830.54 and 391.64 is: 586.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.30 : 830.54 = 391.64 : x
  2. Step 2: Convert to fraction form
    554.30/830.54 = 391.64/x
  3. Step 3: Cross multiply
    554.30x = 830.54 × 391.64
  4. Step 4: Simplify right side
    554.30x = 325,272.69
  5. Step 5: Solve for x
    x = 325,272.69/554.30
  6. Step 6: Final answer
    x = 586.82

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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.