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Finding the Fourth Proportional to 405,152.80, 607,729.20 and 316,679.20

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Solution

The fourth proportional to 405,152.80, 607,729.20 and 316,679.20 is: 475,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,152.80 : 607,729.20 = 316,679.20 : x
  2. Step 2: Convert to fraction form
    405,152.80/607,729.20 = 316,679.20/x
  3. Step 3: Cross multiply
    405,152.80x = 607,729.20 × 316,679.20
  4. Step 4: Simplify right side
    405,152.80x = 192,455,196,872.64
  5. Step 5: Solve for x
    x = 192,455,196,872.64/405,152.80
  6. Step 6: Final answer
    x = 475,018.80

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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.