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Finding the Fourth Proportional to 1,043.29, 1,440 and 623.89

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Solution

The fourth proportional to 1,043.29, 1,440 and 623.89 is: 861.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.29 : 1,440 = 623.89 : x
  2. Step 2: Convert to fraction form
    1,043.29/1,440 = 623.89/x
  3. Step 3: Cross multiply
    1,043.29x = 1,440 × 623.89
  4. Step 4: Simplify right side
    1,043.29x = 898,401.60
  5. Step 5: Solve for x
    x = 898,401.60/1,043.29
  6. Step 6: Final answer
    x = 861.12

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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.