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Finding the Fourth Proportional to 389.90, 581.99 and 357.44

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Solution

The fourth proportional to 389.90, 581.99 and 357.44 is: 533.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.90 : 581.99 = 357.44 : x
  2. Step 2: Convert to fraction form
    389.90/581.99 = 357.44/x
  3. Step 3: Cross multiply
    389.90x = 581.99 × 357.44
  4. Step 4: Simplify right side
    389.90x = 208,021.81
  5. Step 5: Solve for x
    x = 208,021.81/389.90
  6. Step 6: Final answer
    x = 533.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.