Home / 1,254.10-1,880.66-420.98

Finding the Fourth Proportional to 1,254.10, 1,880.66 and 420.98

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Solution

The fourth proportional to 1,254.10, 1,880.66 and 420.98 is: 631.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.10 : 1,880.66 = 420.98 : x
  2. Step 2: Convert to fraction form
    1,254.10/1,880.66 = 420.98/x
  3. Step 3: Cross multiply
    1,254.10x = 1,880.66 × 420.98
  4. Step 4: Simplify right side
    1,254.10x = 791,720.25
  5. Step 5: Solve for x
    x = 791,720.25/1,254.10
  6. Step 6: Final answer
    x = 631.31

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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.