Home / 1,390,831.46-1,918,911.62-778,901.57

Finding the Fourth Proportional to 1,390,831.46, 1,918,911.62 and 778,901.57

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Solution

The fourth proportional to 1,390,831.46, 1,918,911.62 and 778,901.57 is: 1,074,640.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390,831.46 : 1,918,911.62 = 778,901.57 : x
  2. Step 2: Convert to fraction form
    1,390,831.46/1,918,911.62 = 778,901.57/x
  3. Step 3: Cross multiply
    1,390,831.46x = 1,918,911.62 × 778,901.57
  4. Step 4: Simplify right side
    1,390,831.46x = 1,494,643,268,676.54
  5. Step 5: Solve for x
    x = 1,494,643,268,676.54/1,390,831.46
  6. Step 6: Final answer
    x = 1,074,640.11

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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.