Home / 8,415.20-11,621.40-6,937.76

Finding the Fourth Proportional to 8,415.20, 11,621.40 and 6,937.76

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Solution

The fourth proportional to 8,415.20, 11,621.40 and 6,937.76 is: 9,581.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415.20 : 11,621.40 = 6,937.76 : x
  2. Step 2: Convert to fraction form
    8,415.20/11,621.40 = 6,937.76/x
  3. Step 3: Cross multiply
    8,415.20x = 11,621.40 × 6,937.76
  4. Step 4: Simplify right side
    8,415.20x = 80,626,484.06
  5. Step 5: Solve for x
    x = 80,626,484.06/8,415.20
  6. Step 6: Final answer
    x = 9,581.05

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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.