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Finding the Fourth Proportional to 1,389,447.84, 1,917,798.48 and 786,185.76

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Solution

The fourth proportional to 1,389,447.84, 1,917,798.48 and 786,185.76 is: 1,085,140.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,447.84 : 1,917,798.48 = 786,185.76 : x
  2. Step 2: Convert to fraction form
    1,389,447.84/1,917,798.48 = 786,185.76/x
  3. Step 3: Cross multiply
    1,389,447.84x = 1,917,798.48 × 786,185.76
  4. Step 4: Simplify right side
    1,389,447.84x = 1,507,745,855,525.64
  5. Step 5: Solve for x
    x = 1,507,745,855,525.64/1,389,447.84
  6. Step 6: Final answer
    x = 1,085,140.31

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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.