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Finding the Fourth Proportional to 1,646.78, 2,470.20 and 920.98

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Solution

The fourth proportional to 1,646.78, 2,470.20 and 920.98 is: 1,381.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,646.78 : 2,470.20 = 920.98 : x
  2. Step 2: Convert to fraction form
    1,646.78/2,470.20 = 920.98/x
  3. Step 3: Cross multiply
    1,646.78x = 2,470.20 × 920.98
  4. Step 4: Simplify right side
    1,646.78x = 2,275,004.80
  5. Step 5: Solve for x
    x = 2,275,004.80/1,646.78
  6. Step 6: Final answer
    x = 1,381.49

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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.