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Finding the Fourth Proportional to 768,139.20, 1,152,208.80 and 687,268.80

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Solution

The fourth proportional to 768,139.20, 1,152,208.80 and 687,268.80 is: 1,030,903.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    768,139.20 : 1,152,208.80 = 687,268.80 : x
  2. Step 2: Convert to fraction form
    768,139.20/1,152,208.80 = 687,268.80/x
  3. Step 3: Cross multiply
    768,139.20x = 1,152,208.80 × 687,268.80
  4. Step 4: Simplify right side
    768,139.20x = 791,877,159,325.44
  5. Step 5: Solve for x
    x = 791,877,159,325.44/768,139.20
  6. Step 6: Final answer
    x = 1,030,903.20

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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.