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Finding the Fourth Proportional to 1,971.81, 2,957.87 and 655.51

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Solution

The fourth proportional to 1,971.81, 2,957.87 and 655.51 is: 983.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.81 : 2,957.87 = 655.51 : x
  2. Step 2: Convert to fraction form
    1,971.81/2,957.87 = 655.51/x
  3. Step 3: Cross multiply
    1,971.81x = 2,957.87 × 655.51
  4. Step 4: Simplify right side
    1,971.81x = 1,938,910.09
  5. Step 5: Solve for x
    x = 1,938,910.09/1,971.81
  6. Step 6: Final answer
    x = 983.32

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1.5x scale

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.