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Finding the Fourth Proportional to 2,620.70, 3,931.68 and 865.74

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Solution

The fourth proportional to 2,620.70, 3,931.68 and 865.74 is: 1,298.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.70 : 3,931.68 = 865.74 : x
  2. Step 2: Convert to fraction form
    2,620.70/3,931.68 = 865.74/x
  3. Step 3: Cross multiply
    2,620.70x = 3,931.68 × 865.74
  4. Step 4: Simplify right side
    2,620.70x = 3,403,812.64
  5. Step 5: Solve for x
    x = 3,403,812.64/2,620.70
  6. Step 6: Final answer
    x = 1,298.82

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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.