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Finding the Fourth Proportional to 918,805.20, 1,378,523.40 and 413,720.40

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Solution

The fourth proportional to 918,805.20, 1,378,523.40 and 413,720.40 is: 620,722.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,805.20 : 1,378,523.40 = 413,720.40 : x
  2. Step 2: Convert to fraction form
    918,805.20/1,378,523.40 = 413,720.40/x
  3. Step 3: Cross multiply
    918,805.20x = 1,378,523.40 × 413,720.40
  4. Step 4: Simplify right side
    918,805.20x = 570,323,252,457.36
  5. Step 5: Solve for x
    x = 570,323,252,457.36/918,805.20
  6. Step 6: Final answer
    x = 620,722.71

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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.