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Finding the Fourth Proportional to 1,021.78, 1,409.40 and 623.26

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Solution

The fourth proportional to 1,021.78, 1,409.40 and 623.26 is: 859.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.78 : 1,409.40 = 623.26 : x
  2. Step 2: Convert to fraction form
    1,021.78/1,409.40 = 623.26/x
  3. Step 3: Cross multiply
    1,021.78x = 1,409.40 × 623.26
  4. Step 4: Simplify right side
    1,021.78x = 878,422.64
  5. Step 5: Solve for x
    x = 878,422.64/1,021.78
  6. Step 6: Final answer
    x = 859.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.