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Finding the Fourth Proportional to 1,300,547.81, 1,795,369.65 and 978,380.84

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Solution

The fourth proportional to 1,300,547.81, 1,795,369.65 and 978,380.84 is: 1,350,627.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,300,547.81 : 1,795,369.65 = 978,380.84 : x
  2. Step 2: Convert to fraction form
    1,300,547.81/1,795,369.65 = 978,380.84/x
  3. Step 3: Cross multiply
    1,300,547.81x = 1,795,369.65 × 978,380.84
  4. Step 4: Simplify right side
    1,300,547.81x = 1,756,555,266,277.51
  5. Step 5: Solve for x
    x = 1,756,555,266,277.51/1,300,547.81
  6. Step 6: Final answer
    x = 1,350,627.21

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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.