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Finding the Fourth Proportional to 907.60, 1,361.62 and 421

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Solution

The fourth proportional to 907.60, 1,361.62 and 421 is: 631.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.60 : 1,361.62 = 421 : x
  2. Step 2: Convert to fraction form
    907.60/1,361.62 = 421/x
  3. Step 3: Cross multiply
    907.60x = 1,361.62 × 421
  4. Step 4: Simplify right side
    907.60x = 573,242.02
  5. Step 5: Solve for x
    x = 573,242.02/907.60
  6. Step 6: Final answer
    x = 631.60

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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.