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Finding the Fourth Proportional to 995.99, 1,373.85 and 642.38

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Solution

The fourth proportional to 995.99, 1,373.85 and 642.38 is: 886.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.99 : 1,373.85 = 642.38 : x
  2. Step 2: Convert to fraction form
    995.99/1,373.85 = 642.38/x
  3. Step 3: Cross multiply
    995.99x = 1,373.85 × 642.38
  4. Step 4: Simplify right side
    995.99x = 882,526.89
  5. Step 5: Solve for x
    x = 882,526.89/995.99
  6. Step 6: Final answer
    x = 886.08

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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.