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Finding the Fourth Proportional to 403,420.72, 556,716 and 222,128.86

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Solution

The fourth proportional to 403,420.72, 556,716 and 222,128.86 is: 306,535.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    403,420.72 : 556,716 = 222,128.86 : x
  2. Step 2: Convert to fraction form
    403,420.72/556,716 = 222,128.86/x
  3. Step 3: Cross multiply
    403,420.72x = 556,716 × 222,128.86
  4. Step 4: Simplify right side
    403,420.72x = 123,662,690,423.76
  5. Step 5: Solve for x
    x = 123,662,690,423.76/403,420.72
  6. Step 6: Final answer
    x = 306,535.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.