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Finding the Fourth Proportional to 688.64, 949.40 and 570.18

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Solution

The fourth proportional to 688.64, 949.40 and 570.18 is: 786.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.64 : 949.40 = 570.18 : x
  2. Step 2: Convert to fraction form
    688.64/949.40 = 570.18/x
  3. Step 3: Cross multiply
    688.64x = 949.40 × 570.18
  4. Step 4: Simplify right side
    688.64x = 541,326.04
  5. Step 5: Solve for x
    x = 541,326.04/688.64
  6. Step 6: Final answer
    x = 786.09

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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.