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Finding the Fourth Proportional to 1,036.92, 1,554.48 and 421.08

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Solution

The fourth proportional to 1,036.92, 1,554.48 and 421.08 is: 631.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.92 : 1,554.48 = 421.08 : x
  2. Step 2: Convert to fraction form
    1,036.92/1,554.48 = 421.08/x
  3. Step 3: Cross multiply
    1,036.92x = 1,554.48 × 421.08
  4. Step 4: Simplify right side
    1,036.92x = 654,560.44
  5. Step 5: Solve for x
    x = 654,560.44/1,036.92
  6. Step 6: Final answer
    x = 631.25

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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.