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Finding the Fourth Proportional to 2,335.50, 3,222.51 and 1,390.86

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Solution

The fourth proportional to 2,335.50, 3,222.51 and 1,390.86 is: 1,919.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,335.50 : 3,222.51 = 1,390.86 : x
  2. Step 2: Convert to fraction form
    2,335.50/3,222.51 = 1,390.86/x
  3. Step 3: Cross multiply
    2,335.50x = 3,222.51 × 1,390.86
  4. Step 4: Simplify right side
    2,335.50x = 4,482,060.26
  5. Step 5: Solve for x
    x = 4,482,060.26/2,335.50
  6. Step 6: Final answer
    x = 1,919.10

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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.