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Finding the Fourth Proportional to 907.37, 1,361.50 and 420.76

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Solution

The fourth proportional to 907.37, 1,361.50 and 420.76 is: 631.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.37 : 1,361.50 = 420.76 : x
  2. Step 2: Convert to fraction form
    907.37/1,361.50 = 420.76/x
  3. Step 3: Cross multiply
    907.37x = 1,361.50 × 420.76
  4. Step 4: Simplify right side
    907.37x = 572,860.28
  5. Step 5: Solve for x
    x = 572,860.28/907.37
  6. Step 6: Final answer
    x = 631.34

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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.