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Finding the Fourth Proportional to 940.21, 1,410.72 and 420.19

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Solution

The fourth proportional to 940.21, 1,410.72 and 420.19 is: 630.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.21 : 1,410.72 = 420.19 : x
  2. Step 2: Convert to fraction form
    940.21/1,410.72 = 420.19/x
  3. Step 3: Cross multiply
    940.21x = 1,410.72 × 420.19
  4. Step 4: Simplify right side
    940.21x = 592,765.33
  5. Step 5: Solve for x
    x = 592,765.33/940.21
  6. Step 6: Final answer
    x = 630.46

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1.5x scale

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.