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Finding the Fourth Proportional to 7,891.80, 10,890.20 and 4,355.00

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Solution

The fourth proportional to 7,891.80, 10,890.20 and 4,355.00 is: 6,009.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.80 : 10,890.20 = 4,355.00 : x
  2. Step 2: Convert to fraction form
    7,891.80/10,890.20 = 4,355.00/x
  3. Step 3: Cross multiply
    7,891.80x = 10,890.20 × 4,355.00
  4. Step 4: Simplify right side
    7,891.80x = 47,426,744.77
  5. Step 5: Solve for x
    x = 47,426,744.77/7,891.80
  6. Step 6: Final answer
    x = 6,009.62

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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.