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Finding the Fourth Proportional to 3,125.80, 4,688.70 and 817.30

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Solution

The fourth proportional to 3,125.80, 4,688.70 and 817.30 is: 1,225.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,125.80 : 4,688.70 = 817.30 : x
  2. Step 2: Convert to fraction form
    3,125.80/4,688.70 = 817.30/x
  3. Step 3: Cross multiply
    3,125.80x = 4,688.70 × 817.30
  4. Step 4: Simplify right side
    3,125.80x = 3,832,074.51
  5. Step 5: Solve for x
    x = 3,832,074.51/3,125.80
  6. Step 6: Final answer
    x = 1,225.95

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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.