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Finding the Fourth Proportional to 398,422.56, 549,807.06 and 217,130.64

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Solution

The fourth proportional to 398,422.56, 549,807.06 and 217,130.64 is: 299,631.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,422.56 : 549,807.06 = 217,130.64 : x
  2. Step 2: Convert to fraction form
    398,422.56/549,807.06 = 217,130.64/x
  3. Step 3: Cross multiply
    398,422.56x = 549,807.06 × 217,130.64
  4. Step 4: Simplify right side
    398,422.56x = 119,379,958,814.32
  5. Step 5: Solve for x
    x = 119,379,958,814.32/398,422.56
  6. Step 6: Final answer
    x = 299,631.52

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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.