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Finding the Fourth Proportional to 526.78, 790.14 and 142

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Solution

The fourth proportional to 526.78, 790.14 and 142 is: 212.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.78 : 790.14 = 142 : x
  2. Step 2: Convert to fraction form
    526.78/790.14 = 142/x
  3. Step 3: Cross multiply
    526.78x = 790.14 × 142
  4. Step 4: Simplify right side
    526.78x = 112,199.88
  5. Step 5: Solve for x
    x = 112,199.88/526.78
  6. Step 6: Final answer
    x = 212.99

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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.