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Finding the Fourth Proportional to 1,969.90, 2,955.08 and 653.77

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Solution

The fourth proportional to 1,969.90, 2,955.08 and 653.77 is: 980.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,969.90 : 2,955.08 = 653.77 : x
  2. Step 2: Convert to fraction form
    1,969.90/2,955.08 = 653.77/x
  3. Step 3: Cross multiply
    1,969.90x = 2,955.08 × 653.77
  4. Step 4: Simplify right side
    1,969.90x = 1,931,927.68
  5. Step 5: Solve for x
    x = 1,931,927.68/1,969.90
  6. Step 6: Final answer
    x = 980.72

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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.