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Finding the Fourth Proportional to 691.51, 954.26 and 380.99

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Solution

The fourth proportional to 691.51, 954.26 and 380.99 is: 525.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.51 : 954.26 = 380.99 : x
  2. Step 2: Convert to fraction form
    691.51/954.26 = 380.99/x
  3. Step 3: Cross multiply
    691.51x = 954.26 × 380.99
  4. Step 4: Simplify right side
    691.51x = 363,561.61
  5. Step 5: Solve for x
    x = 363,561.61/691.51
  6. Step 6: Final answer
    x = 525.75

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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.