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Finding the Fourth Proportional to 1,018, 1,404.90 and 619.94

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Solution

The fourth proportional to 1,018, 1,404.90 and 619.94 is: 855.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018 : 1,404.90 = 619.94 : x
  2. Step 2: Convert to fraction form
    1,018/1,404.90 = 619.94/x
  3. Step 3: Cross multiply
    1,018x = 1,404.90 × 619.94
  4. Step 4: Simplify right side
    1,018x = 870,953.71
  5. Step 5: Solve for x
    x = 870,953.71/1,018
  6. Step 6: Final answer
    x = 855.55

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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.