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Finding the Fourth Proportional to 420,201, 630,306.99 and 139,718.25

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Solution

The fourth proportional to 420,201, 630,306.99 and 139,718.25 is: 209,579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,201 : 630,306.99 = 139,718.25 : x
  2. Step 2: Convert to fraction form
    420,201/630,306.99 = 139,718.25/x
  3. Step 3: Cross multiply
    420,201x = 630,306.99 × 139,718.25
  4. Step 4: Simplify right side
    420,201x = 88,065,389,605.57
  5. Step 5: Solve for x
    x = 88,065,389,605.57/420,201
  6. Step 6: Final answer
    x = 209,579.20

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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.