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Finding the Fourth Proportional to 471.15, 705.65 and 390.15

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Solution

The fourth proportional to 471.15, 705.65 and 390.15 is: 584.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.15 : 705.65 = 390.15 : x
  2. Step 2: Convert to fraction form
    471.15/705.65 = 390.15/x
  3. Step 3: Cross multiply
    471.15x = 705.65 × 390.15
  4. Step 4: Simplify right side
    471.15x = 275,307.40
  5. Step 5: Solve for x
    x = 275,307.40/471.15
  6. Step 6: Final answer
    x = 584.33

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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.