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Finding the Fourth Proportional to 543.74, 815.59 and 390.95

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Solution

The fourth proportional to 543.74, 815.59 and 390.95 is: 586.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.74 : 815.59 = 390.95 : x
  2. Step 2: Convert to fraction form
    543.74/815.59 = 390.95/x
  3. Step 3: Cross multiply
    543.74x = 815.59 × 390.95
  4. Step 4: Simplify right side
    543.74x = 318,848.88
  5. Step 5: Solve for x
    x = 318,848.88/543.74
  6. Step 6: Final answer
    x = 586.40

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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.