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Finding the Fourth Proportional to 1,392,885.45, 1,922,978.29 and 1,065,595.43

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Solution

The fourth proportional to 1,392,885.45, 1,922,978.29 and 1,065,595.43 is: 1,471,130.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,885.45 : 1,922,978.29 = 1,065,595.43 : x
  2. Step 2: Convert to fraction form
    1,392,885.45/1,922,978.29 = 1,065,595.43/x
  3. Step 3: Cross multiply
    1,392,885.45x = 1,922,978.29 × 1,065,595.43
  4. Step 4: Simplify right side
    1,392,885.45x = 2,049,116,877,813.21
  5. Step 5: Solve for x
    x = 2,049,116,877,813.21/1,392,885.45
  6. Step 6: Final answer
    x = 1,471,130.94

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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.