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Finding the Fourth Proportional to 679,660.80, 1,018,616.40 and 413,138.40

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Solution

The fourth proportional to 679,660.80, 1,018,616.40 and 413,138.40 is: 619,175.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,660.80 : 1,018,616.40 = 413,138.40 : x
  2. Step 2: Convert to fraction form
    679,660.80/1,018,616.40 = 413,138.40/x
  3. Step 3: Cross multiply
    679,660.80x = 1,018,616.40 × 413,138.40
  4. Step 4: Simplify right side
    679,660.80x = 420,829,549,709.76
  5. Step 5: Solve for x
    x = 420,829,549,709.76/679,660.80
  6. Step 6: Final answer
    x = 619,175.84

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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.