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Finding the Fourth Proportional to 3,620.50, 5,430.75 and 1,312

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Solution

The fourth proportional to 3,620.50, 5,430.75 and 1,312 is: 1,968

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.50 : 5,430.75 = 1,312 : x
  2. Step 2: Convert to fraction form
    3,620.50/5,430.75 = 1,312/x
  3. Step 3: Cross multiply
    3,620.50x = 5,430.75 × 1,312
  4. Step 4: Simplify right side
    3,620.50x = 7,125,144
  5. Step 5: Solve for x
    x = 7,125,144/3,620.50
  6. Step 6: Final answer
    x = 1,968

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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.