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Finding the Fourth Proportional to 688.16, 949.53 and 389.40

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Solution

The fourth proportional to 688.16, 949.53 and 389.40 is: 537.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.16 : 949.53 = 389.40 : x
  2. Step 2: Convert to fraction form
    688.16/949.53 = 389.40/x
  3. Step 3: Cross multiply
    688.16x = 949.53 × 389.40
  4. Step 4: Simplify right side
    688.16x = 369,747.96
  5. Step 5: Solve for x
    x = 369,747.96/688.16
  6. Step 6: Final answer
    x = 537.30

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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.