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Finding the Fourth Proportional to 1,150.57, 1,725.93 and 420.05

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Solution

The fourth proportional to 1,150.57, 1,725.93 and 420.05 is: 630.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,150.57 : 1,725.93 = 420.05 : x
  2. Step 2: Convert to fraction form
    1,150.57/1,725.93 = 420.05/x
  3. Step 3: Cross multiply
    1,150.57x = 1,725.93 × 420.05
  4. Step 4: Simplify right side
    1,150.57x = 724,981.21
  5. Step 5: Solve for x
    x = 724,981.21/1,150.57
  6. Step 6: Final answer
    x = 630.11

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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.