Home / 1,391,898.06-1,920,954.15-780,154.74

Finding the Fourth Proportional to 1,391,898.06, 1,920,954.15 and 780,154.74

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Solution

The fourth proportional to 1,391,898.06, 1,920,954.15 and 780,154.74 is: 1,076,689.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391,898.06 : 1,920,954.15 = 780,154.74 : x
  2. Step 2: Convert to fraction form
    1,391,898.06/1,920,954.15 = 780,154.74/x
  3. Step 3: Cross multiply
    1,391,898.06x = 1,920,954.15 × 780,154.74
  4. Step 4: Simplify right side
    1,391,898.06x = 1,498,641,485,445.17
  5. Step 5: Solve for x
    x = 1,498,641,485,445.17/1,391,898.06
  6. Step 6: Final answer
    x = 1,076,689.11

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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.