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Finding the Fourth Proportional to 926.94, 1,390.40 and 378.98

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Solution

The fourth proportional to 926.94, 1,390.40 and 378.98 is: 568.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.94 : 1,390.40 = 378.98 : x
  2. Step 2: Convert to fraction form
    926.94/1,390.40 = 378.98/x
  3. Step 3: Cross multiply
    926.94x = 1,390.40 × 378.98
  4. Step 4: Simplify right side
    926.94x = 526,933.79
  5. Step 5: Solve for x
    x = 526,933.79/926.94
  6. Step 6: Final answer
    x = 568.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.