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Finding the Fourth Proportional to 1,396,978.06, 1,927,493.40 and 815,871.64

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Solution

The fourth proportional to 1,396,978.06, 1,927,493.40 and 815,871.64 is: 1,125,706.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396,978.06 : 1,927,493.40 = 815,871.64 : x
  2. Step 2: Convert to fraction form
    1,396,978.06/1,927,493.40 = 815,871.64/x
  3. Step 3: Cross multiply
    1,396,978.06x = 1,927,493.40 × 815,871.64
  4. Step 4: Simplify right side
    1,396,978.06x = 1,572,587,201,347.18
  5. Step 5: Solve for x
    x = 1,572,587,201,347.18/1,396,978.06
  6. Step 6: Final answer
    x = 1,125,706.44

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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.