Home / 355,015.56-489,984.80-209,815.40

Finding the Fourth Proportional to 355,015.56, 489,984.80 and 209,815.40

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Solution

The fourth proportional to 355,015.56, 489,984.80 and 209,815.40 is: 289,582.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,015.56 : 489,984.80 = 209,815.40 : x
  2. Step 2: Convert to fraction form
    355,015.56/489,984.80 = 209,815.40/x
  3. Step 3: Cross multiply
    355,015.56x = 489,984.80 × 209,815.40
  4. Step 4: Simplify right side
    355,015.56x = 102,806,356,805.92
  5. Step 5: Solve for x
    x = 102,806,356,805.92/355,015.56
  6. Step 6: Final answer
    x = 289,582.68

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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.