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Finding the Fourth Proportional to 1,392,396.75, 1,921,507.52 and 788,784.75

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Solution

The fourth proportional to 1,392,396.75, 1,921,507.52 and 788,784.75 is: 1,088,522.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,396.75 : 1,921,507.52 = 788,784.75 : x
  2. Step 2: Convert to fraction form
    1,392,396.75/1,921,507.52 = 788,784.75/x
  3. Step 3: Cross multiply
    1,392,396.75x = 1,921,507.52 × 788,784.75
  4. Step 4: Simplify right side
    1,392,396.75x = 1,515,655,824,842.40
  5. Step 5: Solve for x
    x = 1,515,655,824,842.40/1,392,396.75
  6. Step 6: Final answer
    x = 1,088,522.96

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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.