Home / 1,389,972-1,918,148.40-786,360

Finding the Fourth Proportional to 1,389,972, 1,918,148.40 and 786,360

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Solution

The fourth proportional to 1,389,972, 1,918,148.40 and 786,360 is: 1,085,169.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,972 : 1,918,148.40 = 786,360 : x
  2. Step 2: Convert to fraction form
    1,389,972/1,918,148.40 = 786,360/x
  3. Step 3: Cross multiply
    1,389,972x = 1,918,148.40 × 786,360
  4. Step 4: Simplify right side
    1,389,972x = 1,508,355,175,824
  5. Step 5: Solve for x
    x = 1,508,355,175,824/1,389,972
  6. Step 6: Final answer
    x = 1,085,169.47

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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.