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Finding the Fourth Proportional to 869.74, 1,302.99 and 522.70

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Solution

The fourth proportional to 869.74, 1,302.99 and 522.70 is: 783.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.74 : 1,302.99 = 522.70 : x
  2. Step 2: Convert to fraction form
    869.74/1,302.99 = 522.70/x
  3. Step 3: Cross multiply
    869.74x = 1,302.99 × 522.70
  4. Step 4: Simplify right side
    869.74x = 681,072.87
  5. Step 5: Solve for x
    x = 681,072.87/869.74
  6. Step 6: Final answer
    x = 783.08

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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.