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Finding the Fourth Proportional to 210,699.50, 315,983.36 and 70,425.32

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Solution

The fourth proportional to 210,699.50, 315,983.36 and 70,425.32 is: 105,615.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,699.50 : 315,983.36 = 70,425.32 : x
  2. Step 2: Convert to fraction form
    210,699.50/315,983.36 = 70,425.32/x
  3. Step 3: Cross multiply
    210,699.50x = 315,983.36 × 70,425.32
  4. Step 4: Simplify right side
    210,699.50x = 22,253,227,838.82
  5. Step 5: Solve for x
    x = 22,253,227,838.82/210,699.50
  6. Step 6: Final answer
    x = 105,615.95

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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.