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Finding the Fourth Proportional to 657.78, 986.78 and 246.98

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Solution

The fourth proportional to 657.78, 986.78 and 246.98 is: 370.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.78 : 986.78 = 246.98 : x
  2. Step 2: Convert to fraction form
    657.78/986.78 = 246.98/x
  3. Step 3: Cross multiply
    657.78x = 986.78 × 246.98
  4. Step 4: Simplify right side
    657.78x = 243,710.61
  5. Step 5: Solve for x
    x = 243,710.61/657.78
  6. Step 6: Final answer
    x = 370.50

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1.5x scale

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.