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Finding the Fourth Proportional to 992.58, 1,370.30 and 619.89

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Solution

The fourth proportional to 992.58, 1,370.30 and 619.89 is: 855.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.58 : 1,370.30 = 619.89 : x
  2. Step 2: Convert to fraction form
    992.58/1,370.30 = 619.89/x
  3. Step 3: Cross multiply
    992.58x = 1,370.30 × 619.89
  4. Step 4: Simplify right side
    992.58x = 849,432.17
  5. Step 5: Solve for x
    x = 849,432.17/992.58
  6. Step 6: Final answer
    x = 855.78

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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.