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Finding the Fourth Proportional to 988.21, 1,363.69 and 651.70

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Solution

The fourth proportional to 988.21, 1,363.69 and 651.70 is: 899.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.21 : 1,363.69 = 651.70 : x
  2. Step 2: Convert to fraction form
    988.21/1,363.69 = 651.70/x
  3. Step 3: Cross multiply
    988.21x = 1,363.69 × 651.70
  4. Step 4: Simplify right side
    988.21x = 888,711.73
  5. Step 5: Solve for x
    x = 888,711.73/988.21
  6. Step 6: Final answer
    x = 899.32

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1.5x scale

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.