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Finding the Fourth Proportional to 389,689.80, 584,534.70 and 256,720.20

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Solution

The fourth proportional to 389,689.80, 584,534.70 and 256,720.20 is: 385,080.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,689.80 : 584,534.70 = 256,720.20 : x
  2. Step 2: Convert to fraction form
    389,689.80/584,534.70 = 256,720.20/x
  3. Step 3: Cross multiply
    389,689.80x = 584,534.70 × 256,720.20
  4. Step 4: Simplify right side
    389,689.80x = 150,061,865,090.94
  5. Step 5: Solve for x
    x = 150,061,865,090.94/389,689.80
  6. Step 6: Final answer
    x = 385,080.30

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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.