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Finding the Fourth Proportional to 977.34, 1,349.91 and 847.98

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Solution

The fourth proportional to 977.34, 1,349.91 and 847.98 is: 1,171.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.34 : 1,349.91 = 847.98 : x
  2. Step 2: Convert to fraction form
    977.34/1,349.91 = 847.98/x
  3. Step 3: Cross multiply
    977.34x = 1,349.91 × 847.98
  4. Step 4: Simplify right side
    977.34x = 1,144,696.68
  5. Step 5: Solve for x
    x = 1,144,696.68/977.34
  6. Step 6: Final answer
    x = 1,171.24

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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.