Home / 1,390,676.76-1,919,042.55-778,689.22

Finding the Fourth Proportional to 1,390,676.76, 1,919,042.55 and 778,689.22

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Solution

The fourth proportional to 1,390,676.76, 1,919,042.55 and 778,689.22 is: 1,074,539.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,676.76 : 1,919,042.55 = 778,689.22 : x
  2. Step 2: Convert to fraction form
    1,390,676.76/1,919,042.55 = 778,689.22/x
  3. Step 3: Cross multiply
    1,390,676.76x = 1,919,042.55 × 778,689.22
  4. Step 4: Simplify right side
    1,390,676.76x = 1,494,337,746,406.31
  5. Step 5: Solve for x
    x = 1,494,337,746,406.31/1,390,676.76
  6. Step 6: Final answer
    x = 1,074,539.96

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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.