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Finding the Fourth Proportional to 982.50, 1,354.77 and 715.74

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Solution

The fourth proportional to 982.50, 1,354.77 and 715.74 is: 986.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.50 : 1,354.77 = 715.74 : x
  2. Step 2: Convert to fraction form
    982.50/1,354.77 = 715.74/x
  3. Step 3: Cross multiply
    982.50x = 1,354.77 × 715.74
  4. Step 4: Simplify right side
    982.50x = 969,663.08
  5. Step 5: Solve for x
    x = 969,663.08/982.50
  6. Step 6: Final answer
    x = 986.93

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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.