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Finding the Fourth Proportional to 619,421.28, 855,062.64 and 418,489.44

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Solution

The fourth proportional to 619,421.28, 855,062.64 and 418,489.44 is: 577,691.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,421.28 : 855,062.64 = 418,489.44 : x
  2. Step 2: Convert to fraction form
    619,421.28/855,062.64 = 418,489.44/x
  3. Step 3: Cross multiply
    619,421.28x = 855,062.64 × 418,489.44
  4. Step 4: Simplify right side
    619,421.28x = 357,834,685,378.52
  5. Step 5: Solve for x
    x = 357,834,685,378.52/619,421.28
  6. Step 6: Final answer
    x = 577,691.95

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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.