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Finding the Fourth Proportional to 661.68, 912.12 and 573.36

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Solution

The fourth proportional to 661.68, 912.12 and 573.36 is: 790.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.68 : 912.12 = 573.36 : x
  2. Step 2: Convert to fraction form
    661.68/912.12 = 573.36/x
  3. Step 3: Cross multiply
    661.68x = 912.12 × 573.36
  4. Step 4: Simplify right side
    661.68x = 522,973.12
  5. Step 5: Solve for x
    x = 522,973.12/661.68
  6. Step 6: Final answer
    x = 790.37

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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.