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Finding the Fourth Proportional to 919.53, 1,378.14 and 431.51

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Solution

The fourth proportional to 919.53, 1,378.14 and 431.51 is: 646.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.53 : 1,378.14 = 431.51 : x
  2. Step 2: Convert to fraction form
    919.53/1,378.14 = 431.51/x
  3. Step 3: Cross multiply
    919.53x = 1,378.14 × 431.51
  4. Step 4: Simplify right side
    919.53x = 594,674.30
  5. Step 5: Solve for x
    x = 594,674.30/919.53
  6. Step 6: Final answer
    x = 646.72

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Double scale
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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.