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Finding the Fourth Proportional to 1,392,502.32, 1,921,646.52 and 788,888.88

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Solution

The fourth proportional to 1,392,502.32, 1,921,646.52 and 788,888.88 is: 1,088,662.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392,502.32 : 1,921,646.52 = 788,888.88 : x
  2. Step 2: Convert to fraction form
    1,392,502.32/1,921,646.52 = 788,888.88/x
  3. Step 3: Cross multiply
    1,392,502.32x = 1,921,646.52 × 788,888.88
  4. Step 4: Simplify right side
    1,392,502.32x = 1,515,965,570,918.70
  5. Step 5: Solve for x
    x = 1,515,965,570,918.70/1,392,502.32
  6. Step 6: Final answer
    x = 1,088,662.87

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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.