Home / 1,390.32-2,086.08-740.28

Finding the Fourth Proportional to 1,390.32, 2,086.08 and 740.28

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Solution

The fourth proportional to 1,390.32, 2,086.08 and 740.28 is: 1,110.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.32 : 2,086.08 = 740.28 : x
  2. Step 2: Convert to fraction form
    1,390.32/2,086.08 = 740.28/x
  3. Step 3: Cross multiply
    1,390.32x = 2,086.08 × 740.28
  4. Step 4: Simplify right side
    1,390.32x = 1,544,283.30
  5. Step 5: Solve for x
    x = 1,544,283.30/1,390.32
  6. Step 6: Final answer
    x = 1,110.74

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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.