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Finding the Fourth Proportional to 619.79, 855.29 and 340.01

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Solution

The fourth proportional to 619.79, 855.29 and 340.01 is: 469.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.79 : 855.29 = 340.01 : x
  2. Step 2: Convert to fraction form
    619.79/855.29 = 340.01/x
  3. Step 3: Cross multiply
    619.79x = 855.29 × 340.01
  4. Step 4: Simplify right side
    619.79x = 290,808.87
  5. Step 5: Solve for x
    x = 290,808.87/619.79
  6. Step 6: Final answer
    x = 469.21

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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.