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Finding the Fourth Proportional to 718.49, 991.48 and 407.99

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Solution

The fourth proportional to 718.49, 991.48 and 407.99 is: 563.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.49 : 991.48 = 407.99 : x
  2. Step 2: Convert to fraction form
    718.49/991.48 = 407.99/x
  3. Step 3: Cross multiply
    718.49x = 991.48 × 407.99
  4. Step 4: Simplify right side
    718.49x = 404,513.93
  5. Step 5: Solve for x
    x = 404,513.93/718.49
  6. Step 6: Final answer
    x = 563.01

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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.