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Finding the Fourth Proportional to 14,603.60, 21,931.80 and 12,789.20

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Solution

The fourth proportional to 14,603.60, 21,931.80 and 12,789.20 is: 19,206.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,603.60 : 21,931.80 = 12,789.20 : x
  2. Step 2: Convert to fraction form
    14,603.60/21,931.80 = 12,789.20/x
  3. Step 3: Cross multiply
    14,603.60x = 21,931.80 × 12,789.20
  4. Step 4: Simplify right side
    14,603.60x = 280,490,176.56
  5. Step 5: Solve for x
    x = 280,490,176.56/14,603.60
  6. Step 6: Final answer
    x = 19,206.92

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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.