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Finding the Fourth Proportional to 554.85, 830.45 and 390.42

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Solution

The fourth proportional to 554.85, 830.45 and 390.42 is: 584.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.85 : 830.45 = 390.42 : x
  2. Step 2: Convert to fraction form
    554.85/830.45 = 390.42/x
  3. Step 3: Cross multiply
    554.85x = 830.45 × 390.42
  4. Step 4: Simplify right side
    554.85x = 324,225.27
  5. Step 5: Solve for x
    x = 324,225.27/554.85
  6. Step 6: Final answer
    x = 584.35

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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.