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Finding the Fourth Proportional to 554.59, 830.95 and 391.48

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Solution

The fourth proportional to 554.59, 830.95 and 391.48 is: 586.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.59 : 830.95 = 391.48 : x
  2. Step 2: Convert to fraction form
    554.59/830.95 = 391.48/x
  3. Step 3: Cross multiply
    554.59x = 830.95 × 391.48
  4. Step 4: Simplify right side
    554.59x = 325,300.31
  5. Step 5: Solve for x
    x = 325,300.31/554.59
  6. Step 6: Final answer
    x = 586.56

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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.