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Finding the Fourth Proportional to 988.15, 1,362.94 and 638.77

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Solution

The fourth proportional to 988.15, 1,362.94 and 638.77 is: 881.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.15 : 1,362.94 = 638.77 : x
  2. Step 2: Convert to fraction form
    988.15/1,362.94 = 638.77/x
  3. Step 3: Cross multiply
    988.15x = 1,362.94 × 638.77
  4. Step 4: Simplify right side
    988.15x = 870,605.18
  5. Step 5: Solve for x
    x = 870,605.18/988.15
  6. Step 6: Final answer
    x = 881.05

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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.