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Finding the Fourth Proportional to 907.76, 1,361.64 and 394.76

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Solution

The fourth proportional to 907.76, 1,361.64 and 394.76 is: 592.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.76 : 1,361.64 = 394.76 : x
  2. Step 2: Convert to fraction form
    907.76/1,361.64 = 394.76/x
  3. Step 3: Cross multiply
    907.76x = 1,361.64 × 394.76
  4. Step 4: Simplify right side
    907.76x = 537,521.01
  5. Step 5: Solve for x
    x = 537,521.01/907.76
  6. Step 6: Final answer
    x = 592.14

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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.