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Finding the Fourth Proportional to 703.66, 1,054.40 and 520.20

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Solution

The fourth proportional to 703.66, 1,054.40 and 520.20 is: 779.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.66 : 1,054.40 = 520.20 : x
  2. Step 2: Convert to fraction form
    703.66/1,054.40 = 520.20/x
  3. Step 3: Cross multiply
    703.66x = 1,054.40 × 520.20
  4. Step 4: Simplify right side
    703.66x = 548,498.88
  5. Step 5: Solve for x
    x = 548,498.88/703.66
  6. Step 6: Final answer
    x = 779.49

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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.