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Finding the Fourth Proportional to 619.86, 848.90 and 611.76

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Solution

The fourth proportional to 619.86, 848.90 and 611.76 is: 837.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.86 : 848.90 = 611.76 : x
  2. Step 2: Convert to fraction form
    619.86/848.90 = 611.76/x
  3. Step 3: Cross multiply
    619.86x = 848.90 × 611.76
  4. Step 4: Simplify right side
    619.86x = 519,320.01
  5. Step 5: Solve for x
    x = 519,320.01/619.86
  6. Step 6: Final answer
    x = 837.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.