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Finding the Fourth Proportional to 1,089.58, 1,503.75 and 623.98

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Solution

The fourth proportional to 1,089.58, 1,503.75 and 623.98 is: 861.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.58 : 1,503.75 = 623.98 : x
  2. Step 2: Convert to fraction form
    1,089.58/1,503.75 = 623.98/x
  3. Step 3: Cross multiply
    1,089.58x = 1,503.75 × 623.98
  4. Step 4: Simplify right side
    1,089.58x = 938,309.93
  5. Step 5: Solve for x
    x = 938,309.93/1,089.58
  6. Step 6: Final answer
    x = 861.17

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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.