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Finding the Fourth Proportional to 521.74, 783.74 and 339.04

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Solution

The fourth proportional to 521.74, 783.74 and 339.04 is: 509.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.74 : 783.74 = 339.04 : x
  2. Step 2: Convert to fraction form
    521.74/783.74 = 339.04/x
  3. Step 3: Cross multiply
    521.74x = 783.74 × 339.04
  4. Step 4: Simplify right side
    521.74x = 265,719.21
  5. Step 5: Solve for x
    x = 265,719.21/521.74
  6. Step 6: Final answer
    x = 509.29

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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.