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Finding the Fourth Proportional to 764.40, 1,146.57 and 417.63

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Solution

The fourth proportional to 764.40, 1,146.57 and 417.63 is: 626.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.40 : 1,146.57 = 417.63 : x
  2. Step 2: Convert to fraction form
    764.40/1,146.57 = 417.63/x
  3. Step 3: Cross multiply
    764.40x = 1,146.57 × 417.63
  4. Step 4: Simplify right side
    764.40x = 478,842.03
  5. Step 5: Solve for x
    x = 478,842.03/764.40
  6. Step 6: Final answer
    x = 626.43

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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.