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Finding the Fourth Proportional to 1,389.63, 1,918.98 and 893.43

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Solution

The fourth proportional to 1,389.63, 1,918.98 and 893.43 is: 1,233.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.63 : 1,918.98 = 893.43 : x
  2. Step 2: Convert to fraction form
    1,389.63/1,918.98 = 893.43/x
  3. Step 3: Cross multiply
    1,389.63x = 1,918.98 × 893.43
  4. Step 4: Simplify right side
    1,389.63x = 1,714,474.30
  5. Step 5: Solve for x
    x = 1,714,474.30/1,389.63
  6. Step 6: Final answer
    x = 1,233.76

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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.