Home / 1,555.71-2,147.28-918.19

Finding the Fourth Proportional to 1,555.71, 2,147.28 and 918.19

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Solution

The fourth proportional to 1,555.71, 2,147.28 and 918.19 is: 1,267.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.71 : 2,147.28 = 918.19 : x
  2. Step 2: Convert to fraction form
    1,555.71/2,147.28 = 918.19/x
  3. Step 3: Cross multiply
    1,555.71x = 2,147.28 × 918.19
  4. Step 4: Simplify right side
    1,555.71x = 1,971,611.02
  5. Step 5: Solve for x
    x = 1,971,611.02/1,555.71
  6. Step 6: Final answer
    x = 1,267.34

Related Problems

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Half scale
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Double scale
Find fourth proportional to 1,556.71, 2,148.66 and 919.19
Similar ratio
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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.