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Finding the Fourth Proportional to 710.82, 980.79 and 448.70

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Solution

The fourth proportional to 710.82, 980.79 and 448.70 is: 619.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.82 : 980.79 = 448.70 : x
  2. Step 2: Convert to fraction form
    710.82/980.79 = 448.70/x
  3. Step 3: Cross multiply
    710.82x = 980.79 × 448.70
  4. Step 4: Simplify right side
    710.82x = 440,075.57
  5. Step 5: Solve for x
    x = 440,075.57/710.82
  6. Step 6: Final answer
    x = 619.11

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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.