Home / 665,426.85-918,291.56-420,520.44

Finding the Fourth Proportional to 665,426.85, 918,291.56 and 420,520.44

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Solution

The fourth proportional to 665,426.85, 918,291.56 and 420,520.44 is: 580,319.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,426.85 : 918,291.56 = 420,520.44 : x
  2. Step 2: Convert to fraction form
    665,426.85/918,291.56 = 420,520.44/x
  3. Step 3: Cross multiply
    665,426.85x = 918,291.56 × 420,520.44
  4. Step 4: Simplify right side
    665,426.85x = 386,160,368,756.88
  5. Step 5: Solve for x
    x = 386,160,368,756.88/665,426.85
  6. Step 6: Final answer
    x = 580,319.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.