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Finding the Fourth Proportional to 1,428,696.63, 1,971,457.79 and 855,722.07

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Solution

The fourth proportional to 1,428,696.63, 1,971,457.79 and 855,722.07 is: 1,180,810.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428,696.63 : 1,971,457.79 = 855,722.07 : x
  2. Step 2: Convert to fraction form
    1,428,696.63/1,971,457.79 = 855,722.07/x
  3. Step 3: Cross multiply
    1,428,696.63x = 1,971,457.79 × 855,722.07
  4. Step 4: Simplify right side
    1,428,696.63x = 1,687,019,936,697.81
  5. Step 5: Solve for x
    x = 1,687,019,936,697.81/1,428,696.63
  6. Step 6: Final answer
    x = 1,180,810.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.