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Finding the Fourth Proportional to 1,411.74, 1,948.20 and 790.74

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Solution

The fourth proportional to 1,411.74, 1,948.20 and 790.74 is: 1,091.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,411.74 : 1,948.20 = 790.74 : x
  2. Step 2: Convert to fraction form
    1,411.74/1,948.20 = 790.74/x
  3. Step 3: Cross multiply
    1,411.74x = 1,948.20 × 790.74
  4. Step 4: Simplify right side
    1,411.74x = 1,540,516.70
  5. Step 5: Solve for x
    x = 1,540,516.70/1,411.74
  6. Step 6: Final answer
    x = 1,091.22

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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.