Home / 1,121.08-1,681.67-427.51

Finding the Fourth Proportional to 1,121.08, 1,681.67 and 427.51

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Solution

The fourth proportional to 1,121.08, 1,681.67 and 427.51 is: 641.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.08 : 1,681.67 = 427.51 : x
  2. Step 2: Convert to fraction form
    1,121.08/1,681.67 = 427.51/x
  3. Step 3: Cross multiply
    1,121.08x = 1,681.67 × 427.51
  4. Step 4: Simplify right side
    1,121.08x = 718,930.74
  5. Step 5: Solve for x
    x = 718,930.74/1,121.08
  6. Step 6: Final answer
    x = 641.28

Related Problems

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Double scale
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1.5x scale

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.