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Finding the Fourth Proportional to 621.77, 858.31 and 419.93

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Solution

The fourth proportional to 621.77, 858.31 and 419.93 is: 579.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.77 : 858.31 = 419.93 : x
  2. Step 2: Convert to fraction form
    621.77/858.31 = 419.93/x
  3. Step 3: Cross multiply
    621.77x = 858.31 × 419.93
  4. Step 4: Simplify right side
    621.77x = 360,424.78
  5. Step 5: Solve for x
    x = 360,424.78/621.77
  6. Step 6: Final answer
    x = 579.67

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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.