Home / 1,389,959.78-1,918,129.82-778,117.56

Finding the Fourth Proportional to 1,389,959.78, 1,918,129.82 and 778,117.56

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Solution

The fourth proportional to 1,389,959.78, 1,918,129.82 and 778,117.56 is: 1,073,794.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,959.78 : 1,918,129.82 = 778,117.56 : x
  2. Step 2: Convert to fraction form
    1,389,959.78/1,918,129.82 = 778,117.56/x
  3. Step 3: Cross multiply
    1,389,959.78x = 1,918,129.82 × 778,117.56
  4. Step 4: Simplify right side
    1,389,959.78x = 1,492,530,495,301.64
  5. Step 5: Solve for x
    x = 1,492,530,495,301.64/1,389,959.78
  6. Step 6: Final answer
    x = 1,073,794.02

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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.