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Finding the Fourth Proportional to 71,420.10, 107,130.15 and 18,834.90

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Solution

The fourth proportional to 71,420.10, 107,130.15 and 18,834.90 is: 28,252.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,420.10 : 107,130.15 = 18,834.90 : x
  2. Step 2: Convert to fraction form
    71,420.10/107,130.15 = 18,834.90/x
  3. Step 3: Cross multiply
    71,420.10x = 107,130.15 × 18,834.90
  4. Step 4: Simplify right side
    71,420.10x = 2,017,785,662.24
  5. Step 5: Solve for x
    x = 2,017,785,662.24/71,420.10
  6. Step 6: Final answer
    x = 28,252.35

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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.