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Finding the Fourth Proportional to 420,302.88, 630,459.80 and 139,820.12

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Solution

The fourth proportional to 420,302.88, 630,459.80 and 139,820.12 is: 209,732.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,302.88 : 630,459.80 = 139,820.12 : x
  2. Step 2: Convert to fraction form
    420,302.88/630,459.80 = 139,820.12/x
  3. Step 3: Cross multiply
    420,302.88x = 630,459.80 × 139,820.12
  4. Step 4: Simplify right side
    420,302.88x = 88,150,964,891.18
  5. Step 5: Solve for x
    x = 88,150,964,891.18/420,302.88
  6. Step 6: Final answer
    x = 209,732.00

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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.