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Finding the Fourth Proportional to 4,859.80, 7,289.70 and 1,781.40

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Solution

The fourth proportional to 4,859.80, 7,289.70 and 1,781.40 is: 2,672.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,859.80 : 7,289.70 = 1,781.40 : x
  2. Step 2: Convert to fraction form
    4,859.80/7,289.70 = 1,781.40/x
  3. Step 3: Cross multiply
    4,859.80x = 7,289.70 × 1,781.40
  4. Step 4: Simplify right side
    4,859.80x = 12,985,871.58
  5. Step 5: Solve for x
    x = 12,985,871.58/4,859.80
  6. Step 6: Final answer
    x = 2,672.10

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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.