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Finding the Fourth Proportional to 19,779.80, 29,660.10 and 11,005.40

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Solution

The fourth proportional to 19,779.80, 29,660.10 and 11,005.40 is: 16,502.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,779.80 : 29,660.10 = 11,005.40 : x
  2. Step 2: Convert to fraction form
    19,779.80/29,660.10 = 11,005.40/x
  3. Step 3: Cross multiply
    19,779.80x = 29,660.10 × 11,005.40
  4. Step 4: Simplify right side
    19,779.80x = 326,421,264.54
  5. Step 5: Solve for x
    x = 326,421,264.54/19,779.80
  6. Step 6: Final answer
    x = 16,502.76

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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.