Home / 8,919.30-12,312.36-5,381.76

Finding the Fourth Proportional to 8,919.30, 12,312.36 and 5,381.76

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Solution

The fourth proportional to 8,919.30, 12,312.36 and 5,381.76 is: 7,429.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,919.30 : 12,312.36 = 5,381.76 : x
  2. Step 2: Convert to fraction form
    8,919.30/12,312.36 = 5,381.76/x
  3. Step 3: Cross multiply
    8,919.30x = 12,312.36 × 5,381.76
  4. Step 4: Simplify right side
    8,919.30x = 66,262,166.55
  5. Step 5: Solve for x
    x = 66,262,166.55/8,919.30
  6. Step 6: Final answer
    x = 7,429.08

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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.