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Finding the Fourth Proportional to 780,139.60, 1,093,670 and 780,139.60

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Solution

The fourth proportional to 780,139.60, 1,093,670 and 780,139.60 is: 1,093,670

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,139.60 : 1,093,670 = 780,139.60 : x
  2. Step 2: Convert to fraction form
    780,139.60/1,093,670 = 780,139.60/x
  3. Step 3: Cross multiply
    780,139.60x = 1,093,670 × 780,139.60
  4. Step 4: Simplify right side
    780,139.60x = 853,215,276,332
  5. Step 5: Solve for x
    x = 853,215,276,332/780,139.60
  6. Step 6: Final answer
    x = 1,093,670

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.