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Finding the Fourth Proportional to 1,216,823.72, 1,679,441.34 and 781,784.88

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Solution

The fourth proportional to 1,216,823.72, 1,679,441.34 and 781,784.88 is: 1,079,007.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216,823.72 : 1,679,441.34 = 781,784.88 : x
  2. Step 2: Convert to fraction form
    1,216,823.72/1,679,441.34 = 781,784.88/x
  3. Step 3: Cross multiply
    1,216,823.72x = 1,679,441.34 × 781,784.88
  4. Step 4: Simplify right side
    1,216,823.72x = 1,312,961,846,458.94
  5. Step 5: Solve for x
    x = 1,312,961,846,458.94/1,216,823.72
  6. Step 6: Final answer
    x = 1,079,007.44

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1.5x scale

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.