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Finding the Fourth Proportional to 1,978.46, 2,966.68 and 661.74

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Solution

The fourth proportional to 1,978.46, 2,966.68 and 661.74 is: 992.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.46 : 2,966.68 = 661.74 : x
  2. Step 2: Convert to fraction form
    1,978.46/2,966.68 = 661.74/x
  3. Step 3: Cross multiply
    1,978.46x = 2,966.68 × 661.74
  4. Step 4: Simplify right side
    1,978.46x = 1,963,169.17
  5. Step 5: Solve for x
    x = 1,963,169.17/1,978.46
  6. Step 6: Final answer
    x = 992.27

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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.