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Finding the Fourth Proportional to 705, 972.90 and 406.30

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Solution

The fourth proportional to 705, 972.90 and 406.30 is: 560.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    705 : 972.90 = 406.30 : x
  2. Step 2: Convert to fraction form
    705/972.90 = 406.30/x
  3. Step 3: Cross multiply
    705x = 972.90 × 406.30
  4. Step 4: Simplify right side
    705x = 395,289.27
  5. Step 5: Solve for x
    x = 395,289.27/705
  6. Step 6: Final answer
    x = 560.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.