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Finding the Fourth Proportional to 991.50, 1,488.79 and 947.68

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Solution

The fourth proportional to 991.50, 1,488.79 and 947.68 is: 1,422.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.50 : 1,488.79 = 947.68 : x
  2. Step 2: Convert to fraction form
    991.50/1,488.79 = 947.68/x
  3. Step 3: Cross multiply
    991.50x = 1,488.79 × 947.68
  4. Step 4: Simplify right side
    991.50x = 1,410,896.51
  5. Step 5: Solve for x
    x = 1,410,896.51/991.50
  6. Step 6: Final answer
    x = 1,422.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.