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Finding the Fourth Proportional to 977.67, 1,347.97 and 790.47

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Solution

The fourth proportional to 977.67, 1,347.97 and 790.47 is: 1,089.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.67 : 1,347.97 = 790.47 : x
  2. Step 2: Convert to fraction form
    977.67/1,347.97 = 790.47/x
  3. Step 3: Cross multiply
    977.67x = 1,347.97 × 790.47
  4. Step 4: Simplify right side
    977.67x = 1,065,529.85
  5. Step 5: Solve for x
    x = 1,065,529.85/977.67
  6. Step 6: Final answer
    x = 1,089.87

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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.