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Finding the Fourth Proportional to 470.40, 705.70 and 145.78

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Solution

The fourth proportional to 470.40, 705.70 and 145.78 is: 218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.40 : 705.70 = 145.78 : x
  2. Step 2: Convert to fraction form
    470.40/705.70 = 145.78/x
  3. Step 3: Cross multiply
    470.40x = 705.70 × 145.78
  4. Step 4: Simplify right side
    470.40x = 102,876.95
  5. Step 5: Solve for x
    x = 102,876.95/470.40
  6. Step 6: Final answer
    x = 218.70

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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.