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Finding the Fourth Proportional to 139,031.20, 191,864.04 and 75,370

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Solution

The fourth proportional to 139,031.20, 191,864.04 and 75,370 is: 104,011.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,031.20 : 191,864.04 = 75,370 : x
  2. Step 2: Convert to fraction form
    139,031.20/191,864.04 = 75,370/x
  3. Step 3: Cross multiply
    139,031.20x = 191,864.04 × 75,370
  4. Step 4: Simplify right side
    139,031.20x = 14,460,792,694.80
  5. Step 5: Solve for x
    x = 14,460,792,694.80/139,031.20
  6. Step 6: Final answer
    x = 104,011.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.