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Finding the Fourth Proportional to 1,115.81, 1,673.74 and 785.40

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Solution

The fourth proportional to 1,115.81, 1,673.74 and 785.40 is: 1,178.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.81 : 1,673.74 = 785.40 : x
  2. Step 2: Convert to fraction form
    1,115.81/1,673.74 = 785.40/x
  3. Step 3: Cross multiply
    1,115.81x = 1,673.74 × 785.40
  4. Step 4: Simplify right side
    1,115.81x = 1,314,555.40
  5. Step 5: Solve for x
    x = 1,314,555.40/1,115.81
  6. Step 6: Final answer
    x = 1,178.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.