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Finding the Fourth Proportional to 420,011.48, 630,005.88 and 135,701.48

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Solution

The fourth proportional to 420,011.48, 630,005.88 and 135,701.48 is: 203,548.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,011.48 : 630,005.88 = 135,701.48 : x
  2. Step 2: Convert to fraction form
    420,011.48/630,005.88 = 135,701.48/x
  3. Step 3: Cross multiply
    420,011.48x = 630,005.88 × 135,701.48
  4. Step 4: Simplify right side
    420,011.48x = 85,492,730,324.70
  5. Step 5: Solve for x
    x = 85,492,730,324.70/420,011.48
  6. Step 6: Final answer
    x = 203,548.56

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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.