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Finding the Fourth Proportional to 992.83, 1,370.10 and 619.87

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Solution

The fourth proportional to 992.83, 1,370.10 and 619.87 is: 855.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.83 : 1,370.10 = 619.87 : x
  2. Step 2: Convert to fraction form
    992.83/1,370.10 = 619.87/x
  3. Step 3: Cross multiply
    992.83x = 1,370.10 × 619.87
  4. Step 4: Simplify right side
    992.83x = 849,283.89
  5. Step 5: Solve for x
    x = 849,283.89/992.83
  6. Step 6: Final answer
    x = 855.42

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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.