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Finding the Fourth Proportional to 420,641.08, 630,967.08 and 121,126.56

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Solution

The fourth proportional to 420,641.08, 630,967.08 and 121,126.56 is: 181,691.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,641.08 : 630,967.08 = 121,126.56 : x
  2. Step 2: Convert to fraction form
    420,641.08/630,967.08 = 121,126.56/x
  3. Step 3: Cross multiply
    420,641.08x = 630,967.08 × 121,126.56
  4. Step 4: Simplify right side
    420,641.08x = 76,426,871,873.64
  5. Step 5: Solve for x
    x = 76,426,871,873.64/420,641.08
  6. Step 6: Final answer
    x = 181,691.41

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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.