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Finding the Fourth Proportional to 1,089, 1,502.88 and 623.40

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Solution

The fourth proportional to 1,089, 1,502.88 and 623.40 is: 860.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089 : 1,502.88 = 623.40 : x
  2. Step 2: Convert to fraction form
    1,089/1,502.88 = 623.40/x
  3. Step 3: Cross multiply
    1,089x = 1,502.88 × 623.40
  4. Step 4: Simplify right side
    1,089x = 936,895.39
  5. Step 5: Solve for x
    x = 936,895.39/1,089
  6. Step 6: Final answer
    x = 860.33

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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.