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Finding the Fourth Proportional to 343,358.80, 515,038.20 and 143,612.80

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Solution

The fourth proportional to 343,358.80, 515,038.20 and 143,612.80 is: 215,419.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    343,358.80 : 515,038.20 = 143,612.80 : x
  2. Step 2: Convert to fraction form
    343,358.80/515,038.20 = 143,612.80/x
  3. Step 3: Cross multiply
    343,358.80x = 515,038.20 × 143,612.80
  4. Step 4: Simplify right side
    343,358.80x = 73,966,078,008.96
  5. Step 5: Solve for x
    x = 73,966,078,008.96/343,358.80
  6. Step 6: Final answer
    x = 215,419.20

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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.