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Finding the Fourth Proportional to 278,935.40, 418,403.10 and 172,404.20

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Solution

The fourth proportional to 278,935.40, 418,403.10 and 172,404.20 is: 258,606.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,935.40 : 418,403.10 = 172,404.20 : x
  2. Step 2: Convert to fraction form
    278,935.40/418,403.10 = 172,404.20/x
  3. Step 3: Cross multiply
    278,935.40x = 418,403.10 × 172,404.20
  4. Step 4: Simplify right side
    278,935.40x = 72,134,451,733.02
  5. Step 5: Solve for x
    x = 72,134,451,733.02/278,935.40
  6. Step 6: Final answer
    x = 258,606.30

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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.