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Finding the Fourth Proportional to 806,720.80, 1,210,081.20 and 771,291.40

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Solution

The fourth proportional to 806,720.80, 1,210,081.20 and 771,291.40 is: 1,156,937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    806,720.80 : 1,210,081.20 = 771,291.40 : x
  2. Step 2: Convert to fraction form
    806,720.80/1,210,081.20 = 771,291.40/x
  3. Step 3: Cross multiply
    806,720.80x = 1,210,081.20 × 771,291.40
  4. Step 4: Simplify right side
    806,720.80x = 933,325,222,861.68
  5. Step 5: Solve for x
    x = 933,325,222,861.68/806,720.80
  6. Step 6: Final answer
    x = 1,156,937.10

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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.