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Finding the Fourth Proportional to 948.76, 1,311.26 and 715.48

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Solution

The fourth proportional to 948.76, 1,311.26 and 715.48 is: 988.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.76 : 1,311.26 = 715.48 : x
  2. Step 2: Convert to fraction form
    948.76/1,311.26 = 715.48/x
  3. Step 3: Cross multiply
    948.76x = 1,311.26 × 715.48
  4. Step 4: Simplify right side
    948.76x = 938,180.30
  5. Step 5: Solve for x
    x = 938,180.30/948.76
  6. Step 6: Final answer
    x = 988.85

Related Problems

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Half scale
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Double scale
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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.