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Finding the Fourth Proportional to 393,381.40, 590,315.10 and 156,699.40

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Solution

The fourth proportional to 393,381.40, 590,315.10 and 156,699.40 is: 235,145.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,381.40 : 590,315.10 = 156,699.40 : x
  2. Step 2: Convert to fraction form
    393,381.40/590,315.10 = 156,699.40/x
  3. Step 3: Cross multiply
    393,381.40x = 590,315.10 × 156,699.40
  4. Step 4: Simplify right side
    393,381.40x = 92,502,021,980.94
  5. Step 5: Solve for x
    x = 92,502,021,980.94/393,381.40
  6. Step 6: Final answer
    x = 235,145.90

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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.