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Finding the Fourth Proportional to 521.04, 780.55 and 347.30

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Solution

The fourth proportional to 521.04, 780.55 and 347.30 is: 520.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.04 : 780.55 = 347.30 : x
  2. Step 2: Convert to fraction form
    521.04/780.55 = 347.30/x
  3. Step 3: Cross multiply
    521.04x = 780.55 × 347.30
  4. Step 4: Simplify right side
    521.04x = 271,085.02
  5. Step 5: Solve for x
    x = 271,085.02/521.04
  6. Step 6: Final answer
    x = 520.28

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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.