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Finding the Fourth Proportional to 8,782.90, 12,117.02 and 5,419.88

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Solution

The fourth proportional to 8,782.90, 12,117.02 and 5,419.88 is: 7,477.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,782.90 : 12,117.02 = 5,419.88 : x
  2. Step 2: Convert to fraction form
    8,782.90/12,117.02 = 5,419.88/x
  3. Step 3: Cross multiply
    8,782.90x = 12,117.02 × 5,419.88
  4. Step 4: Simplify right side
    8,782.90x = 65,672,794.36
  5. Step 5: Solve for x
    x = 65,672,794.36/8,782.90
  6. Step 6: Final answer
    x = 7,477.35

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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.