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Finding the Fourth Proportional to 707.60, 1,057.24 and 521.68

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Solution

The fourth proportional to 707.60, 1,057.24 and 521.68 is: 779.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.60 : 1,057.24 = 521.68 : x
  2. Step 2: Convert to fraction form
    707.60/1,057.24 = 521.68/x
  3. Step 3: Cross multiply
    707.60x = 1,057.24 × 521.68
  4. Step 4: Simplify right side
    707.60x = 551,540.96
  5. Step 5: Solve for x
    x = 551,540.96/707.60
  6. Step 6: Final answer
    x = 779.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.