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Finding the Fourth Proportional to 618,658.68, 928,066.50 and 219,221.40

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Solution

The fourth proportional to 618,658.68, 928,066.50 and 219,221.40 is: 328,859.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,658.68 : 928,066.50 = 219,221.40 : x
  2. Step 2: Convert to fraction form
    618,658.68/928,066.50 = 219,221.40/x
  3. Step 3: Cross multiply
    618,658.68x = 928,066.50 × 219,221.40
  4. Step 4: Simplify right side
    618,658.68x = 203,452,037,423.10
  5. Step 5: Solve for x
    x = 203,452,037,423.10/618,658.68
  6. Step 6: Final answer
    x = 328,859.91

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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.