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Finding the Fourth Proportional to 1,390,555.96, 1,918,751.69 and 778,734.61

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Solution

The fourth proportional to 1,390,555.96, 1,918,751.69 and 778,734.61 is: 1,074,533.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,555.96 : 1,918,751.69 = 778,734.61 : x
  2. Step 2: Convert to fraction form
    1,390,555.96/1,918,751.69 = 778,734.61/x
  3. Step 3: Cross multiply
    1,390,555.96x = 1,918,751.69 × 778,734.61
  4. Step 4: Simplify right side
    1,390,555.96x = 1,494,198,346,148.95
  5. Step 5: Solve for x
    x = 1,494,198,346,148.95/1,390,555.96
  6. Step 6: Final answer
    x = 1,074,533.06

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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.