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Finding the Fourth Proportional to 713.49, 985.41 and 619.74

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Solution

The fourth proportional to 713.49, 985.41 and 619.74 is: 855.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.49 : 985.41 = 619.74 : x
  2. Step 2: Convert to fraction form
    713.49/985.41 = 619.74/x
  3. Step 3: Cross multiply
    713.49x = 985.41 × 619.74
  4. Step 4: Simplify right side
    713.49x = 610,697.99
  5. Step 5: Solve for x
    x = 610,697.99/713.49
  6. Step 6: Final answer
    x = 855.93

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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.