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Finding the Fourth Proportional to 942.42, 1,412.40 and 455.20

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Solution

The fourth proportional to 942.42, 1,412.40 and 455.20 is: 682.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.42 : 1,412.40 = 455.20 : x
  2. Step 2: Convert to fraction form
    942.42/1,412.40 = 455.20/x
  3. Step 3: Cross multiply
    942.42x = 1,412.40 × 455.20
  4. Step 4: Simplify right side
    942.42x = 642,924.48
  5. Step 5: Solve for x
    x = 642,924.48/942.42
  6. Step 6: Final answer
    x = 682.21

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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.