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Finding the Fourth Proportional to 1,916.76, 2,641.62 and 1,391.88

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Solution

The fourth proportional to 1,916.76, 2,641.62 and 1,391.88 is: 1,918.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.76 : 2,641.62 = 1,391.88 : x
  2. Step 2: Convert to fraction form
    1,916.76/2,641.62 = 1,391.88/x
  3. Step 3: Cross multiply
    1,916.76x = 2,641.62 × 1,391.88
  4. Step 4: Simplify right side
    1,916.76x = 3,676,818.05
  5. Step 5: Solve for x
    x = 3,676,818.05/1,916.76
  6. Step 6: Final answer
    x = 1,918.25

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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.