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Finding the Fourth Proportional to 1,225.62, 1,838.68 and 712.50

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Solution

The fourth proportional to 1,225.62, 1,838.68 and 712.50 is: 1,068.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.62 : 1,838.68 = 712.50 : x
  2. Step 2: Convert to fraction form
    1,225.62/1,838.68 = 712.50/x
  3. Step 3: Cross multiply
    1,225.62x = 1,838.68 × 712.50
  4. Step 4: Simplify right side
    1,225.62x = 1,310,059.50
  5. Step 5: Solve for x
    x = 1,310,059.50/1,225.62
  6. Step 6: Final answer
    x = 1,068.90

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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.