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Finding the Fourth Proportional to 798.76, 1,102.76 and 715.72

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Solution

The fourth proportional to 798.76, 1,102.76 and 715.72 is: 988.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.76 : 1,102.76 = 715.72 : x
  2. Step 2: Convert to fraction form
    798.76/1,102.76 = 715.72/x
  3. Step 3: Cross multiply
    798.76x = 1,102.76 × 715.72
  4. Step 4: Simplify right side
    798.76x = 789,267.39
  5. Step 5: Solve for x
    x = 789,267.39/798.76
  6. Step 6: Final answer
    x = 988.12

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.