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Finding the Fourth Proportional to 812,957.80, 1,121,866.56 and 490,681.48

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Solution

The fourth proportional to 812,957.80, 1,121,866.56 and 490,681.48 is: 677,131.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,957.80 : 1,121,866.56 = 490,681.48 : x
  2. Step 2: Convert to fraction form
    812,957.80/1,121,866.56 = 490,681.48/x
  3. Step 3: Cross multiply
    812,957.80x = 1,121,866.56 × 490,681.48
  4. Step 4: Simplify right side
    812,957.80x = 550,479,144,023.31
  5. Step 5: Solve for x
    x = 550,479,144,023.31/812,957.80
  6. Step 6: Final answer
    x = 677,131.27

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1.5x scale

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.