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Finding the Fourth Proportional to 70,916.41, 106,390.17 and 21,000.40

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Solution

The fourth proportional to 70,916.41, 106,390.17 and 21,000.40 is: 31,505.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,916.41 : 106,390.17 = 21,000.40 : x
  2. Step 2: Convert to fraction form
    70,916.41/106,390.17 = 21,000.40/x
  3. Step 3: Cross multiply
    70,916.41x = 106,390.17 × 21,000.40
  4. Step 4: Simplify right side
    70,916.41x = 2,234,236,126.07
  5. Step 5: Solve for x
    x = 2,234,236,126.07/70,916.41
  6. Step 6: Final answer
    x = 31,505.21

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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.