Home / 1,290,051.47-1,780,290.80-709,299.78

Finding the Fourth Proportional to 1,290,051.47, 1,780,290.80 and 709,299.78

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Solution

The fourth proportional to 1,290,051.47, 1,780,290.80 and 709,299.78 is: 978,844.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290,051.47 : 1,780,290.80 = 709,299.78 : x
  2. Step 2: Convert to fraction form
    1,290,051.47/1,780,290.80 = 709,299.78/x
  3. Step 3: Cross multiply
    1,290,051.47x = 1,780,290.80 × 709,299.78
  4. Step 4: Simplify right side
    1,290,051.47x = 1,262,759,872,776.02
  5. Step 5: Solve for x
    x = 1,262,759,872,776.02/1,290,051.47
  6. Step 6: Final answer
    x = 978,844.57

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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.