Home / 5,119.07-7,678.40-1,421.69

Finding the Fourth Proportional to 5,119.07, 7,678.40 and 1,421.69

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Solution

The fourth proportional to 5,119.07, 7,678.40 and 1,421.69 is: 2,132.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,119.07 : 7,678.40 = 1,421.69 : x
  2. Step 2: Convert to fraction form
    5,119.07/7,678.40 = 1,421.69/x
  3. Step 3: Cross multiply
    5,119.07x = 7,678.40 × 1,421.69
  4. Step 4: Simplify right side
    5,119.07x = 10,916,259.00
  5. Step 5: Solve for x
    x = 10,916,259.00/5,119.07
  6. Step 6: Final answer
    x = 2,132.47

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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.