Home / 1,390.14-1,918.38-800.64

Finding the Fourth Proportional to 1,390.14, 1,918.38 and 800.64

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Solution

The fourth proportional to 1,390.14, 1,918.38 and 800.64 is: 1,104.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.14 : 1,918.38 = 800.64 : x
  2. Step 2: Convert to fraction form
    1,390.14/1,918.38 = 800.64/x
  3. Step 3: Cross multiply
    1,390.14x = 1,918.38 × 800.64
  4. Step 4: Simplify right side
    1,390.14x = 1,535,931.76
  5. Step 5: Solve for x
    x = 1,535,931.76/1,390.14
  6. Step 6: Final answer
    x = 1,104.88

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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.