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Finding the Fourth Proportional to 1,428,506.04, 1,971,362.28 and 783,986.20

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Solution

The fourth proportional to 1,428,506.04, 1,971,362.28 and 783,986.20 is: 1,081,914.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428,506.04 : 1,971,362.28 = 783,986.20 : x
  2. Step 2: Convert to fraction form
    1,428,506.04/1,971,362.28 = 783,986.20/x
  3. Step 3: Cross multiply
    1,428,506.04x = 1,971,362.28 × 783,986.20
  4. Step 4: Simplify right side
    1,428,506.04x = 1,545,520,822,720.54
  5. Step 5: Solve for x
    x = 1,545,520,822,720.54/1,428,506.04
  6. Step 6: Final answer
    x = 1,081,914.10

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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.