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Finding the Fourth Proportional to 715.51, 1,072.99 and 253.20

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Solution

The fourth proportional to 715.51, 1,072.99 and 253.20 is: 379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.51 : 1,072.99 = 253.20 : x
  2. Step 2: Convert to fraction form
    715.51/1,072.99 = 253.20/x
  3. Step 3: Cross multiply
    715.51x = 1,072.99 × 253.20
  4. Step 4: Simplify right side
    715.51x = 271,679.80
  5. Step 5: Solve for x
    x = 271,679.80/715.51
  6. Step 6: Final answer
    x = 379.70

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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.