Home / 780,143.20-1,170,214.80-638,425.60

Finding the Fourth Proportional to 780,143.20, 1,170,214.80 and 638,425.60

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Solution

The fourth proportional to 780,143.20, 1,170,214.80 and 638,425.60 is: 957,638.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,143.20 : 1,170,214.80 = 638,425.60 : x
  2. Step 2: Convert to fraction form
    780,143.20/1,170,214.80 = 638,425.60/x
  3. Step 3: Cross multiply
    780,143.20x = 1,170,214.80 × 638,425.60
  4. Step 4: Simplify right side
    780,143.20x = 747,095,085,818.88
  5. Step 5: Solve for x
    x = 747,095,085,818.88/780,143.20
  6. Step 6: Final answer
    x = 957,638.40

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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.