Home / 813,980.20-1,220,106.30-392,981.80

Finding the Fourth Proportional to 813,980.20, 1,220,106.30 and 392,981.80

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Solution

The fourth proportional to 813,980.20, 1,220,106.30 and 392,981.80 is: 589,055.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    813,980.20 : 1,220,106.30 = 392,981.80 : x
  2. Step 2: Convert to fraction form
    813,980.20/1,220,106.30 = 392,981.80/x
  3. Step 3: Cross multiply
    813,980.20x = 1,220,106.30 × 392,981.80
  4. Step 4: Simplify right side
    813,980.20x = 479,479,569,965.34
  5. Step 5: Solve for x
    x = 479,479,569,965.34/813,980.20
  6. Step 6: Final answer
    x = 589,055.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.