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Finding the Fourth Proportional to 983.66, 1,475.68 and 435.86

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Solution

The fourth proportional to 983.66, 1,475.68 and 435.86 is: 653.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.66 : 1,475.68 = 435.86 : x
  2. Step 2: Convert to fraction form
    983.66/1,475.68 = 435.86/x
  3. Step 3: Cross multiply
    983.66x = 1,475.68 × 435.86
  4. Step 4: Simplify right side
    983.66x = 643,192.48
  5. Step 5: Solve for x
    x = 643,192.48/983.66
  6. Step 6: Final answer
    x = 653.88

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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.