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Finding the Fourth Proportional to 469.05, 647.47 and 419.84

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Solution

The fourth proportional to 469.05, 647.47 and 419.84 is: 579.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.05 : 647.47 = 419.84 : x
  2. Step 2: Convert to fraction form
    469.05/647.47 = 419.84/x
  3. Step 3: Cross multiply
    469.05x = 647.47 × 419.84
  4. Step 4: Simplify right side
    469.05x = 271,835.95
  5. Step 5: Solve for x
    x = 271,835.95/469.05
  6. Step 6: Final answer
    x = 579.55

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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.