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Finding the Fourth Proportional to 718.07, 991.44 and 571.05

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Solution

The fourth proportional to 718.07, 991.44 and 571.05 is: 788.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.07 : 991.44 = 571.05 : x
  2. Step 2: Convert to fraction form
    718.07/991.44 = 571.05/x
  3. Step 3: Cross multiply
    718.07x = 991.44 × 571.05
  4. Step 4: Simplify right side
    718.07x = 566,161.81
  5. Step 5: Solve for x
    x = 566,161.81/718.07
  6. Step 6: Final answer
    x = 788.45

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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.