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Finding the Fourth Proportional to 977.36, 1,348.53 and 627.98

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Solution

The fourth proportional to 977.36, 1,348.53 and 627.98 is: 866.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.36 : 1,348.53 = 627.98 : x
  2. Step 2: Convert to fraction form
    977.36/1,348.53 = 627.98/x
  3. Step 3: Cross multiply
    977.36x = 1,348.53 × 627.98
  4. Step 4: Simplify right side
    977.36x = 846,849.87
  5. Step 5: Solve for x
    x = 846,849.87/977.36
  6. Step 6: Final answer
    x = 866.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.