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Finding the Fourth Proportional to 1,397,032.74, 1,927,471.70 and 815,836.61

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Solution

The fourth proportional to 1,397,032.74, 1,927,471.70 and 815,836.61 is: 1,125,601.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397,032.74 : 1,927,471.70 = 815,836.61 : x
  2. Step 2: Convert to fraction form
    1,397,032.74/1,927,471.70 = 815,836.61/x
  3. Step 3: Cross multiply
    1,397,032.74x = 1,927,471.70 × 815,836.61
  4. Step 4: Simplify right side
    1,397,032.74x = 1,572,501,963,882.40
  5. Step 5: Solve for x
    x = 1,572,501,963,882.40/1,397,032.74
  6. Step 6: Final answer
    x = 1,125,601.37

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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.