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Finding the Fourth Proportional to 705.38, 1,057.47 and 340.43

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Solution

The fourth proportional to 705.38, 1,057.47 and 340.43 is: 510.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.38 : 1,057.47 = 340.43 : x
  2. Step 2: Convert to fraction form
    705.38/1,057.47 = 340.43/x
  3. Step 3: Cross multiply
    705.38x = 1,057.47 × 340.43
  4. Step 4: Simplify right side
    705.38x = 359,991.02
  5. Step 5: Solve for x
    x = 359,991.02/705.38
  6. Step 6: Final answer
    x = 510.35

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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.