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Finding the Fourth Proportional to 821,605.20, 1,232,407.80 and 780,133.20

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Solution

The fourth proportional to 821,605.20, 1,232,407.80 and 780,133.20 is: 1,170,199.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,605.20 : 1,232,407.80 = 780,133.20 : x
  2. Step 2: Convert to fraction form
    821,605.20/1,232,407.80 = 780,133.20/x
  3. Step 3: Cross multiply
    821,605.20x = 1,232,407.80 × 780,133.20
  4. Step 4: Simplify right side
    821,605.20x = 961,442,240,718.96
  5. Step 5: Solve for x
    x = 961,442,240,718.96/821,605.20
  6. Step 6: Final answer
    x = 1,170,199.80

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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.