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Finding the Fourth Proportional to 1,161,721.20, 1,742,581.80 and 866,809.20

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Solution

The fourth proportional to 1,161,721.20, 1,742,581.80 and 866,809.20 is: 1,300,213.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161,721.20 : 1,742,581.80 = 866,809.20 : x
  2. Step 2: Convert to fraction form
    1,161,721.20/1,742,581.80 = 866,809.20/x
  3. Step 3: Cross multiply
    1,161,721.20x = 1,742,581.80 × 866,809.20
  4. Step 4: Simplify right side
    1,161,721.20x = 1,510,485,935,992.56
  5. Step 5: Solve for x
    x = 1,510,485,935,992.56/1,161,721.20
  6. Step 6: Final answer
    x = 1,300,213.80

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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.