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Finding the Fourth Proportional to 211,349.16, 316,931.58 and 79,929

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Solution

The fourth proportional to 211,349.16, 316,931.58 and 79,929 is: 119,858.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,349.16 : 316,931.58 = 79,929 : x
  2. Step 2: Convert to fraction form
    211,349.16/316,931.58 = 79,929/x
  3. Step 3: Cross multiply
    211,349.16x = 316,931.58 × 79,929
  4. Step 4: Simplify right side
    211,349.16x = 25,332,024,257.82
  5. Step 5: Solve for x
    x = 25,332,024,257.82/211,349.16
  6. Step 6: Final answer
    x = 119,858.65

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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.