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Finding the Fourth Proportional to 1,115.88, 1,541.40 and 785.40

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Solution

The fourth proportional to 1,115.88, 1,541.40 and 785.40 is: 1,084.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.88 : 1,541.40 = 785.40 : x
  2. Step 2: Convert to fraction form
    1,115.88/1,541.40 = 785.40/x
  3. Step 3: Cross multiply
    1,115.88x = 1,541.40 × 785.40
  4. Step 4: Simplify right side
    1,115.88x = 1,210,615.56
  5. Step 5: Solve for x
    x = 1,210,615.56/1,115.88
  6. Step 6: Final answer
    x = 1,084.90

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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.