Home / 1,987,128.80-2,979,235.20-788,458.40

Finding the Fourth Proportional to 1,987,128.80, 2,979,235.20 and 788,458.40

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Solution

The fourth proportional to 1,987,128.80, 2,979,235.20 and 788,458.40 is: 1,182,109.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987,128.80 : 2,979,235.20 = 788,458.40 : x
  2. Step 2: Convert to fraction form
    1,987,128.80/2,979,235.20 = 788,458.40/x
  3. Step 3: Cross multiply
    1,987,128.80x = 2,979,235.20 × 788,458.40
  4. Step 4: Simplify right side
    1,987,128.80x = 2,349,003,019,015.68
  5. Step 5: Solve for x
    x = 2,349,003,019,015.68/1,987,128.80
  6. Step 6: Final answer
    x = 1,182,109.09

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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.