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Finding the Fourth Proportional to 1,387,831.74, 1,915,736.31 and 904,514.46

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Solution

The fourth proportional to 1,387,831.74, 1,915,736.31 and 904,514.46 is: 1,248,574.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,831.74 : 1,915,736.31 = 904,514.46 : x
  2. Step 2: Convert to fraction form
    1,387,831.74/1,915,736.31 = 904,514.46/x
  3. Step 3: Cross multiply
    1,387,831.74x = 1,915,736.31 × 904,514.46
  4. Step 4: Simplify right side
    1,387,831.74x = 1,732,811,193,942.04
  5. Step 5: Solve for x
    x = 1,732,811,193,942.04/1,387,831.74
  6. Step 6: Final answer
    x = 1,248,574.41

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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.