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Finding the Fourth Proportional to 1,187.19, 1,780.48 and 528.69

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Solution

The fourth proportional to 1,187.19, 1,780.48 and 528.69 is: 792.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.19 : 1,780.48 = 528.69 : x
  2. Step 2: Convert to fraction form
    1,187.19/1,780.48 = 528.69/x
  3. Step 3: Cross multiply
    1,187.19x = 1,780.48 × 528.69
  4. Step 4: Simplify right side
    1,187.19x = 941,329.31
  5. Step 5: Solve for x
    x = 941,329.31/1,187.19
  6. Step 6: Final answer
    x = 792.91

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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.