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Finding the Fourth Proportional to 977.70, 1,346.13 and 911.46

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Solution

The fourth proportional to 977.70, 1,346.13 and 911.46 is: 1,254.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.70 : 1,346.13 = 911.46 : x
  2. Step 2: Convert to fraction form
    977.70/1,346.13 = 911.46/x
  3. Step 3: Cross multiply
    977.70x = 1,346.13 × 911.46
  4. Step 4: Simplify right side
    977.70x = 1,226,943.65
  5. Step 5: Solve for x
    x = 1,226,943.65/977.70
  6. Step 6: Final answer
    x = 1,254.93

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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.