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Finding the Fourth Proportional to 948.99, 1,422.55 and 486.98

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Solution

The fourth proportional to 948.99, 1,422.55 and 486.98 is: 729.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.99 : 1,422.55 = 486.98 : x
  2. Step 2: Convert to fraction form
    948.99/1,422.55 = 486.98/x
  3. Step 3: Cross multiply
    948.99x = 1,422.55 × 486.98
  4. Step 4: Simplify right side
    948.99x = 692,753.40
  5. Step 5: Solve for x
    x = 692,753.40/948.99
  6. Step 6: Final answer
    x = 729.99

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Double scale
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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.