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Finding the Fourth Proportional to 1,115.17, 1,673.05 and 384.80

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Solution

The fourth proportional to 1,115.17, 1,673.05 and 384.80 is: 577.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.17 : 1,673.05 = 384.80 : x
  2. Step 2: Convert to fraction form
    1,115.17/1,673.05 = 384.80/x
  3. Step 3: Cross multiply
    1,115.17x = 1,673.05 × 384.80
  4. Step 4: Simplify right side
    1,115.17x = 643,784.50
  5. Step 5: Solve for x
    x = 643,784.50/1,115.17
  6. Step 6: Final answer
    x = 577.30

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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.