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Finding the Fourth Proportional to 345,387, 518,056.74 and 212,287.80

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Solution

The fourth proportional to 345,387, 518,056.74 and 212,287.80 is: 318,417.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    345,387 : 518,056.74 = 212,287.80 : x
  2. Step 2: Convert to fraction form
    345,387/518,056.74 = 212,287.80/x
  3. Step 3: Cross multiply
    345,387x = 518,056.74 × 212,287.80
  4. Step 4: Simplify right side
    345,387x = 109,977,125,609.77
  5. Step 5: Solve for x
    x = 109,977,125,609.77/345,387
  6. Step 6: Final answer
    x = 318,417.10

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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.