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Finding the Fourth Proportional to 1,047.42, 1,571.22 and 430.92

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Solution

The fourth proportional to 1,047.42, 1,571.22 and 430.92 is: 646.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.42 : 1,571.22 = 430.92 : x
  2. Step 2: Convert to fraction form
    1,047.42/1,571.22 = 430.92/x
  3. Step 3: Cross multiply
    1,047.42x = 1,571.22 × 430.92
  4. Step 4: Simplify right side
    1,047.42x = 677,070.12
  5. Step 5: Solve for x
    x = 677,070.12/1,047.42
  6. Step 6: Final answer
    x = 646.42

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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.