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Finding the Fourth Proportional to 14,917.70, 20,915.50 and 14,917.70

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Solution

The fourth proportional to 14,917.70, 20,915.50 and 14,917.70 is: 20,915.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,917.70 : 20,915.50 = 14,917.70 : x
  2. Step 2: Convert to fraction form
    14,917.70/20,915.50 = 14,917.70/x
  3. Step 3: Cross multiply
    14,917.70x = 20,915.50 × 14,917.70
  4. Step 4: Simplify right side
    14,917.70x = 312,011,154.35
  5. Step 5: Solve for x
    x = 312,011,154.35/14,917.70
  6. Step 6: Final answer
    x = 20,915.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.