Home / 20,931.20-28,883.20-12,432.68

Finding the Fourth Proportional to 20,931.20, 28,883.20 and 12,432.68

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Solution

The fourth proportional to 20,931.20, 28,883.20 and 12,432.68 is: 17,156.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.20 : 28,883.20 = 12,432.68 : x
  2. Step 2: Convert to fraction form
    20,931.20/28,883.20 = 12,432.68/x
  3. Step 3: Cross multiply
    20,931.20x = 28,883.20 × 12,432.68
  4. Step 4: Simplify right side
    20,931.20x = 359,095,582.98
  5. Step 5: Solve for x
    x = 359,095,582.98/20,931.20
  6. Step 6: Final answer
    x = 17,156.00

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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.