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Finding the Fourth Proportional to 1,424,595.78, 1,965,941.73 and 780,015.78

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Solution

The fourth proportional to 1,424,595.78, 1,965,941.73 and 780,015.78 is: 1,076,421.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424,595.78 : 1,965,941.73 = 780,015.78 : x
  2. Step 2: Convert to fraction form
    1,424,595.78/1,965,941.73 = 780,015.78/x
  3. Step 3: Cross multiply
    1,424,595.78x = 1,965,941.73 × 780,015.78
  4. Step 4: Simplify right side
    1,424,595.78x = 1,533,465,571,960.50
  5. Step 5: Solve for x
    x = 1,533,465,571,960.50/1,424,595.78
  6. Step 6: Final answer
    x = 1,076,421.53

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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.