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Finding the Fourth Proportional to 1,089.14, 1,502.79 and 623.39

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Solution

The fourth proportional to 1,089.14, 1,502.79 and 623.39 is: 860.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.14 : 1,502.79 = 623.39 : x
  2. Step 2: Convert to fraction form
    1,089.14/1,502.79 = 623.39/x
  3. Step 3: Cross multiply
    1,089.14x = 1,502.79 × 623.39
  4. Step 4: Simplify right side
    1,089.14x = 936,824.26
  5. Step 5: Solve for x
    x = 936,824.26/1,089.14
  6. Step 6: Final answer
    x = 860.15

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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.