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Finding the Fourth Proportional to 1,146.92, 1,720.40 and 416.30

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Solution

The fourth proportional to 1,146.92, 1,720.40 and 416.30 is: 624.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,146.92 : 1,720.40 = 416.30 : x
  2. Step 2: Convert to fraction form
    1,146.92/1,720.40 = 416.30/x
  3. Step 3: Cross multiply
    1,146.92x = 1,720.40 × 416.30
  4. Step 4: Simplify right side
    1,146.92x = 716,191.84
  5. Step 5: Solve for x
    x = 716,191.84/1,146.92
  6. Step 6: Final answer
    x = 624.45

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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.