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Finding the Fourth Proportional to 780,130.20, 1,090,782.60 and 780,130.20

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Solution

The fourth proportional to 780,130.20, 1,090,782.60 and 780,130.20 is: 1,090,782.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    780,130.20 : 1,090,782.60 = 780,130.20 : x
  2. Step 2: Convert to fraction form
    780,130.20/1,090,782.60 = 780,130.20/x
  3. Step 3: Cross multiply
    780,130.20x = 1,090,782.60 × 780,130.20
  4. Step 4: Simplify right side
    780,130.20x = 850,952,447,894.52
  5. Step 5: Solve for x
    x = 850,952,447,894.52/780,130.20
  6. Step 6: Final answer
    x = 1,090,782.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.