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Finding the Fourth Proportional to 700.78, 1,050.45 and 353.05

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Solution

The fourth proportional to 700.78, 1,050.45 and 353.05 is: 529.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.78 : 1,050.45 = 353.05 : x
  2. Step 2: Convert to fraction form
    700.78/1,050.45 = 353.05/x
  3. Step 3: Cross multiply
    700.78x = 1,050.45 × 353.05
  4. Step 4: Simplify right side
    700.78x = 370,861.37
  5. Step 5: Solve for x
    x = 370,861.37/700.78
  6. Step 6: Final answer
    x = 529.21

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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.