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Finding the Fourth Proportional to 907.23, 1,361.30 and 420.63

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Solution

The fourth proportional to 907.23, 1,361.30 and 420.63 is: 631.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.23 : 1,361.30 = 420.63 : x
  2. Step 2: Convert to fraction form
    907.23/1,361.30 = 420.63/x
  3. Step 3: Cross multiply
    907.23x = 1,361.30 × 420.63
  4. Step 4: Simplify right side
    907.23x = 572,603.62
  5. Step 5: Solve for x
    x = 572,603.62/907.23
  6. Step 6: Final answer
    x = 631.16

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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.