Home / 420,104.10-630,156.15-139,621.35

Finding the Fourth Proportional to 420,104.10, 630,156.15 and 139,621.35

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Solution

The fourth proportional to 420,104.10, 630,156.15 and 139,621.35 is: 209,432.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,104.10 : 630,156.15 = 139,621.35 : x
  2. Step 2: Convert to fraction form
    420,104.10/630,156.15 = 139,621.35/x
  3. Step 3: Cross multiply
    420,104.10x = 630,156.15 × 139,621.35
  4. Step 4: Simplify right side
    420,104.10x = 87,983,252,373.80
  5. Step 5: Solve for x
    x = 87,983,252,373.80/420,104.10
  6. Step 6: Final answer
    x = 209,432.03

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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.