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Finding the Fourth Proportional to 1,242.75, 1,715.36 and 828.75

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Solution

The fourth proportional to 1,242.75, 1,715.36 and 828.75 is: 1,143.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.75 : 1,715.36 = 828.75 : x
  2. Step 2: Convert to fraction form
    1,242.75/1,715.36 = 828.75/x
  3. Step 3: Cross multiply
    1,242.75x = 1,715.36 × 828.75
  4. Step 4: Simplify right side
    1,242.75x = 1,421,600.46
  5. Step 5: Solve for x
    x = 1,421,600.46/1,242.75
  6. Step 6: Final answer
    x = 1,143.92

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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.