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Finding the Fourth Proportional to 848.79, 1,272.42 and 540.81

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Solution

The fourth proportional to 848.79, 1,272.42 and 540.81 is: 810.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.79 : 1,272.42 = 540.81 : x
  2. Step 2: Convert to fraction form
    848.79/1,272.42 = 540.81/x
  3. Step 3: Cross multiply
    848.79x = 1,272.42 × 540.81
  4. Step 4: Simplify right side
    848.79x = 688,137.46
  5. Step 5: Solve for x
    x = 688,137.46/848.79
  6. Step 6: Final answer
    x = 810.73

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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.