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Finding the Fourth Proportional to 1,780.90, 2,457.68 and 994.95

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Solution

The fourth proportional to 1,780.90, 2,457.68 and 994.95 is: 1,373.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,780.90 : 2,457.68 = 994.95 : x
  2. Step 2: Convert to fraction form
    1,780.90/2,457.68 = 994.95/x
  3. Step 3: Cross multiply
    1,780.90x = 2,457.68 × 994.95
  4. Step 4: Simplify right side
    1,780.90x = 2,445,268.72
  5. Step 5: Solve for x
    x = 2,445,268.72/1,780.90
  6. Step 6: Final answer
    x = 1,373.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.