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Finding the Fourth Proportional to 470.46, 705.76 and 145.76

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Solution

The fourth proportional to 470.46, 705.76 and 145.76 is: 218.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.46 : 705.76 = 145.76 : x
  2. Step 2: Convert to fraction form
    470.46/705.76 = 145.76/x
  3. Step 3: Cross multiply
    470.46x = 705.76 × 145.76
  4. Step 4: Simplify right side
    470.46x = 102,871.58
  5. Step 5: Solve for x
    x = 102,871.58/470.46
  6. Step 6: Final answer
    x = 218.66

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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.