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Finding the Fourth Proportional to 983.86, 1,475.91 and 435.94

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Solution

The fourth proportional to 983.86, 1,475.91 and 435.94 is: 653.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.86 : 1,475.91 = 435.94 : x
  2. Step 2: Convert to fraction form
    983.86/1,475.91 = 435.94/x
  3. Step 3: Cross multiply
    983.86x = 1,475.91 × 435.94
  4. Step 4: Simplify right side
    983.86x = 643,408.21
  5. Step 5: Solve for x
    x = 643,408.21/983.86
  6. Step 6: Final answer
    x = 653.96

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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.