Home / 686,728.80-1,030,190.40-213,364.80

Finding the Fourth Proportional to 686,728.80, 1,030,190.40 and 213,364.80

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Solution

The fourth proportional to 686,728.80, 1,030,190.40 and 213,364.80 is: 320,077.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,728.80 : 1,030,190.40 = 213,364.80 : x
  2. Step 2: Convert to fraction form
    686,728.80/1,030,190.40 = 213,364.80/x
  3. Step 3: Cross multiply
    686,728.80x = 1,030,190.40 × 213,364.80
  4. Step 4: Simplify right side
    686,728.80x = 219,806,368,657.92
  5. Step 5: Solve for x
    x = 219,806,368,657.92/686,728.80
  6. Step 6: Final answer
    x = 320,077.40

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Double scale
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Similar ratio
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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.