Home / 1,916.76-2,645.55-1,218

Finding the Fourth Proportional to 1,916.76, 2,645.55 and 1,218

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Solution

The fourth proportional to 1,916.76, 2,645.55 and 1,218 is: 1,681.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.76 : 2,645.55 = 1,218 : x
  2. Step 2: Convert to fraction form
    1,916.76/2,645.55 = 1,218/x
  3. Step 3: Cross multiply
    1,916.76x = 2,645.55 × 1,218
  4. Step 4: Simplify right side
    1,916.76x = 3,222,279.90
  5. Step 5: Solve for x
    x = 3,222,279.90/1,916.76
  6. Step 6: Final answer
    x = 1,681.11

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Half scale
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Double scale
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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.