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Finding the Fourth Proportional to 21,579, 29,779.80 and 12,019.32

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Solution

The fourth proportional to 21,579, 29,779.80 and 12,019.32 is: 16,587.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579 : 29,779.80 = 12,019.32 : x
  2. Step 2: Convert to fraction form
    21,579/29,779.80 = 12,019.32/x
  3. Step 3: Cross multiply
    21,579x = 29,779.80 × 12,019.32
  4. Step 4: Simplify right side
    21,579x = 357,932,945.74
  5. Step 5: Solve for x
    x = 357,932,945.74/21,579
  6. Step 6: Final answer
    x = 16,587.10

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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.