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Finding the Fourth Proportional to 651.20, 975.40 and 419.58

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Solution

The fourth proportional to 651.20, 975.40 and 419.58 is: 628.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.20 : 975.40 = 419.58 : x
  2. Step 2: Convert to fraction form
    651.20/975.40 = 419.58/x
  3. Step 3: Cross multiply
    651.20x = 975.40 × 419.58
  4. Step 4: Simplify right side
    651.20x = 409,257.28
  5. Step 5: Solve for x
    x = 409,257.28/651.20
  6. Step 6: Final answer
    x = 628.47

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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.