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Finding the Fourth Proportional to 821,529.60, 1,232,390.40 and 260,620.80

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Solution

The fourth proportional to 821,529.60, 1,232,390.40 and 260,620.80 is: 390,961.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,529.60 : 1,232,390.40 = 260,620.80 : x
  2. Step 2: Convert to fraction form
    821,529.60/1,232,390.40 = 260,620.80/x
  3. Step 3: Cross multiply
    821,529.60x = 1,232,390.40 × 260,620.80
  4. Step 4: Simplify right side
    821,529.60x = 321,186,571,960.32
  5. Step 5: Solve for x
    x = 321,186,571,960.32/821,529.60
  6. Step 6: Final answer
    x = 390,961.65

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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.