Home / 1,388.81-2,080.90-977.08

Finding the Fourth Proportional to 1,388.81, 2,080.90 and 977.08

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Solution

The fourth proportional to 1,388.81, 2,080.90 and 977.08 is: 1,463.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.81 : 2,080.90 = 977.08 : x
  2. Step 2: Convert to fraction form
    1,388.81/2,080.90 = 977.08/x
  3. Step 3: Cross multiply
    1,388.81x = 2,080.90 × 977.08
  4. Step 4: Simplify right side
    1,388.81x = 2,033,205.77
  5. Step 5: Solve for x
    x = 2,033,205.77/1,388.81
  6. Step 6: Final answer
    x = 1,463.99

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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.