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Finding the Fourth Proportional to 859.86, 1,186.64 and 528.48

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Solution

The fourth proportional to 859.86, 1,186.64 and 528.48 is: 729.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.86 : 1,186.64 = 528.48 : x
  2. Step 2: Convert to fraction form
    859.86/1,186.64 = 528.48/x
  3. Step 3: Cross multiply
    859.86x = 1,186.64 × 528.48
  4. Step 4: Simplify right side
    859.86x = 627,115.51
  5. Step 5: Solve for x
    x = 627,115.51/859.86
  6. Step 6: Final answer
    x = 729.32

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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.