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Finding the Fourth Proportional to 625.74, 869.40 and 618

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Solution

The fourth proportional to 625.74, 869.40 and 618 is: 858.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.74 : 869.40 = 618 : x
  2. Step 2: Convert to fraction form
    625.74/869.40 = 618/x
  3. Step 3: Cross multiply
    625.74x = 869.40 × 618
  4. Step 4: Simplify right side
    625.74x = 537,289.20
  5. Step 5: Solve for x
    x = 537,289.20/625.74
  6. Step 6: Final answer
    x = 858.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.