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Finding the Fourth Proportional to 619.68, 855.16 and 386.76

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Solution

The fourth proportional to 619.68, 855.16 and 386.76 is: 533.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.68 : 855.16 = 386.76 : x
  2. Step 2: Convert to fraction form
    619.68/855.16 = 386.76/x
  3. Step 3: Cross multiply
    619.68x = 855.16 × 386.76
  4. Step 4: Simplify right side
    619.68x = 330,741.68
  5. Step 5: Solve for x
    x = 330,741.68/619.68
  6. Step 6: Final answer
    x = 533.73

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1.5x scale

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.