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Finding the Fourth Proportional to 1,405,669.76, 1,939,963.20 and 802,148.48

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Solution

The fourth proportional to 1,405,669.76, 1,939,963.20 and 802,148.48 is: 1,107,044.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405,669.76 : 1,939,963.20 = 802,148.48 : x
  2. Step 2: Convert to fraction form
    1,405,669.76/1,939,963.20 = 802,148.48/x
  3. Step 3: Cross multiply
    1,405,669.76x = 1,939,963.20 × 802,148.48
  4. Step 4: Simplify right side
    1,405,669.76x = 1,556,138,532,135.94
  5. Step 5: Solve for x
    x = 1,556,138,532,135.94/1,405,669.76
  6. Step 6: Final answer
    x = 1,107,044.18

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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.