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Finding the Fourth Proportional to 887.69, 1,330.85 and 612.99

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Solution

The fourth proportional to 887.69, 1,330.85 and 612.99 is: 919.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.69 : 1,330.85 = 612.99 : x
  2. Step 2: Convert to fraction form
    887.69/1,330.85 = 612.99/x
  3. Step 3: Cross multiply
    887.69x = 1,330.85 × 612.99
  4. Step 4: Simplify right side
    887.69x = 815,799.27
  5. Step 5: Solve for x
    x = 815,799.27/887.69
  6. Step 6: Final answer
    x = 919.01

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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.