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Finding the Fourth Proportional to 1,223,679, 1,688,489.53 and 679,764.81

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Solution

The fourth proportional to 1,223,679, 1,688,489.53 and 679,764.81 is: 937,971.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223,679 : 1,688,489.53 = 679,764.81 : x
  2. Step 2: Convert to fraction form
    1,223,679/1,688,489.53 = 679,764.81/x
  3. Step 3: Cross multiply
    1,223,679x = 1,688,489.53 × 679,764.81
  4. Step 4: Simplify right side
    1,223,679x = 1,147,775,764,547.44
  5. Step 5: Solve for x
    x = 1,147,775,764,547.44/1,223,679
  6. Step 6: Final answer
    x = 937,971.29

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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.