Home / 420,126.90-630,190.35-139,607.70

Finding the Fourth Proportional to 420,126.90, 630,190.35 and 139,607.70

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Solution

The fourth proportional to 420,126.90, 630,190.35 and 139,607.70 is: 209,411.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,126.90 : 630,190.35 = 139,607.70 : x
  2. Step 2: Convert to fraction form
    420,126.90/630,190.35 = 139,607.70/x
  3. Step 3: Cross multiply
    420,126.90x = 630,190.35 × 139,607.70
  4. Step 4: Simplify right side
    420,126.90x = 87,979,425,325.70
  5. Step 5: Solve for x
    x = 87,979,425,325.70/420,126.90
  6. Step 6: Final answer
    x = 209,411.55

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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.