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Finding the Fourth Proportional to 780,012.80, 1,170,019.20 and 425,718.80

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Solution

The fourth proportional to 780,012.80, 1,170,019.20 and 425,718.80 is: 638,578.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,012.80 : 1,170,019.20 = 425,718.80 : x
  2. Step 2: Convert to fraction form
    780,012.80/1,170,019.20 = 425,718.80/x
  3. Step 3: Cross multiply
    780,012.80x = 1,170,019.20 × 425,718.80
  4. Step 4: Simplify right side
    780,012.80x = 498,099,169,800.96
  5. Step 5: Solve for x
    x = 498,099,169,800.96/780,012.80
  6. Step 6: Final answer
    x = 638,578.20

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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.