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Finding the Fourth Proportional to 830.24, 1,245.72 and 253.16

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Solution

The fourth proportional to 830.24, 1,245.72 and 253.16 is: 379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.24 : 1,245.72 = 253.16 : x
  2. Step 2: Convert to fraction form
    830.24/1,245.72 = 253.16/x
  3. Step 3: Cross multiply
    830.24x = 1,245.72 × 253.16
  4. Step 4: Simplify right side
    830.24x = 315,366.48
  5. Step 5: Solve for x
    x = 315,366.48/830.24
  6. Step 6: Final answer
    x = 379.85

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Double scale
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1.5x scale

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.