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Finding the Fourth Proportional to 420,381.32, 630,821.12 and 393,783.16

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Solution

The fourth proportional to 420,381.32, 630,821.12 and 393,783.16 is: 590,908.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,381.32 : 630,821.12 = 393,783.16 : x
  2. Step 2: Convert to fraction form
    420,381.32/630,821.12 = 393,783.16/x
  3. Step 3: Cross multiply
    420,381.32x = 630,821.12 × 393,783.16
  4. Step 4: Simplify right side
    420,381.32x = 248,406,734,028.34
  5. Step 5: Solve for x
    x = 248,406,734,028.34/420,381.32
  6. Step 6: Final answer
    x = 590,908.12

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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.