Home / 1,218.83-1,680.78-1,117.64

Finding the Fourth Proportional to 1,218.83, 1,680.78 and 1,117.64

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Solution

The fourth proportional to 1,218.83, 1,680.78 and 1,117.64 is: 1,541.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.83 : 1,680.78 = 1,117.64 : x
  2. Step 2: Convert to fraction form
    1,218.83/1,680.78 = 1,117.64/x
  3. Step 3: Cross multiply
    1,218.83x = 1,680.78 × 1,117.64
  4. Step 4: Simplify right side
    1,218.83x = 1,878,511.16
  5. Step 5: Solve for x
    x = 1,878,511.16/1,218.83
  6. Step 6: Final answer
    x = 1,541.25

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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.