Home / 918,811.20-1,378,216.80-287,918.40

Finding the Fourth Proportional to 918,811.20, 1,378,216.80 and 287,918.40

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Solution

The fourth proportional to 918,811.20, 1,378,216.80 and 287,918.40 is: 431,877.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,811.20 : 1,378,216.80 = 287,918.40 : x
  2. Step 2: Convert to fraction form
    918,811.20/1,378,216.80 = 287,918.40/x
  3. Step 3: Cross multiply
    918,811.20x = 1,378,216.80 × 287,918.40
  4. Step 4: Simplify right side
    918,811.20x = 396,813,975,909.12
  5. Step 5: Solve for x
    x = 396,813,975,909.12/918,811.20
  6. Step 6: Final answer
    x = 431,877.60

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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.