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Finding the Fourth Proportional to 1,653.01, 2,479.30 and 420.31

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Solution

The fourth proportional to 1,653.01, 2,479.30 and 420.31 is: 630.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,653.01 : 2,479.30 = 420.31 : x
  2. Step 2: Convert to fraction form
    1,653.01/2,479.30 = 420.31/x
  3. Step 3: Cross multiply
    1,653.01x = 2,479.30 × 420.31
  4. Step 4: Simplify right side
    1,653.01x = 1,042,074.58
  5. Step 5: Solve for x
    x = 1,042,074.58/1,653.01
  6. Step 6: Final answer
    x = 630.41

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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.