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Finding the Fourth Proportional to 607.15, 910.86 and 390.43

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Solution

The fourth proportional to 607.15, 910.86 and 390.43 is: 585.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    607.15 : 910.86 = 390.43 : x
  2. Step 2: Convert to fraction form
    607.15/910.86 = 390.43/x
  3. Step 3: Cross multiply
    607.15x = 910.86 × 390.43
  4. Step 4: Simplify right side
    607.15x = 355,627.07
  5. Step 5: Solve for x
    x = 355,627.07/607.15
  6. Step 6: Final answer
    x = 585.73

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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.