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Finding the Fourth Proportional to 590.74, 815.21 and 328.76

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Solution

The fourth proportional to 590.74, 815.21 and 328.76 is: 453.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    590.74 : 815.21 = 328.76 : x
  2. Step 2: Convert to fraction form
    590.74/815.21 = 328.76/x
  3. Step 3: Cross multiply
    590.74x = 815.21 × 328.76
  4. Step 4: Simplify right side
    590.74x = 268,008.44
  5. Step 5: Solve for x
    x = 268,008.44/590.74
  6. Step 6: Final answer
    x = 453.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.