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Finding the Fourth Proportional to 212,985.52, 319,384.80 and 79,772.32

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Solution

The fourth proportional to 212,985.52, 319,384.80 and 79,772.32 is: 119,623.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,985.52 : 319,384.80 = 79,772.32 : x
  2. Step 2: Convert to fraction form
    212,985.52/319,384.80 = 79,772.32/x
  3. Step 3: Cross multiply
    212,985.52x = 319,384.80 × 79,772.32
  4. Step 4: Simplify right side
    212,985.52x = 25,478,066,468.74
  5. Step 5: Solve for x
    x = 25,478,066,468.74/212,985.52
  6. Step 6: Final answer
    x = 119,623.47

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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.