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Finding the Fourth Proportional to 557.64, 835.74 and 419.40

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Solution

The fourth proportional to 557.64, 835.74 and 419.40 is: 628.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.64 : 835.74 = 419.40 : x
  2. Step 2: Convert to fraction form
    557.64/835.74 = 419.40/x
  3. Step 3: Cross multiply
    557.64x = 835.74 × 419.40
  4. Step 4: Simplify right side
    557.64x = 350,509.36
  5. Step 5: Solve for x
    x = 350,509.36/557.64
  6. Step 6: Final answer
    x = 628.56

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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.