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Finding the Fourth Proportional to 1,103.90, 1,655.70 and 410.47

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Solution

The fourth proportional to 1,103.90, 1,655.70 and 410.47 is: 615.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.90 : 1,655.70 = 410.47 : x
  2. Step 2: Convert to fraction form
    1,103.90/1,655.70 = 410.47/x
  3. Step 3: Cross multiply
    1,103.90x = 1,655.70 × 410.47
  4. Step 4: Simplify right side
    1,103.90x = 679,611.04
  5. Step 5: Solve for x
    x = 679,611.04/1,103.90
  6. Step 6: Final answer
    x = 615.64

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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.