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Finding the Fourth Proportional to 20,656.48, 28,506.48 and 12,159.04

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Solution

The fourth proportional to 20,656.48, 28,506.48 and 12,159.04 is: 16,779.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,656.48 : 28,506.48 = 12,159.04 : x
  2. Step 2: Convert to fraction form
    20,656.48/28,506.48 = 12,159.04/x
  3. Step 3: Cross multiply
    20,656.48x = 28,506.48 × 12,159.04
  4. Step 4: Simplify right side
    20,656.48x = 346,611,430.58
  5. Step 5: Solve for x
    x = 346,611,430.58/20,656.48
  6. Step 6: Final answer
    x = 16,779.79

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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.