Home / 780,187.80-1,170,281.70-689,986.20

Finding the Fourth Proportional to 780,187.80, 1,170,281.70 and 689,986.20

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Solution

The fourth proportional to 780,187.80, 1,170,281.70 and 689,986.20 is: 1,034,979.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,187.80 : 1,170,281.70 = 689,986.20 : x
  2. Step 2: Convert to fraction form
    780,187.80/1,170,281.70 = 689,986.20/x
  3. Step 3: Cross multiply
    780,187.80x = 1,170,281.70 × 689,986.20
  4. Step 4: Simplify right side
    780,187.80x = 807,478,223,112.54
  5. Step 5: Solve for x
    x = 807,478,223,112.54/780,187.80
  6. Step 6: Final answer
    x = 1,034,979.30

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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.