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Finding the Fourth Proportional to 70,908.81, 97,856.21 and 39,079.76

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Solution

The fourth proportional to 70,908.81, 97,856.21 and 39,079.76 is: 53,931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,908.81 : 97,856.21 = 39,079.76 : x
  2. Step 2: Convert to fraction form
    70,908.81/97,856.21 = 39,079.76/x
  3. Step 3: Cross multiply
    70,908.81x = 97,856.21 × 39,079.76
  4. Step 4: Simplify right side
    70,908.81x = 3,824,197,005.91
  5. Step 5: Solve for x
    x = 3,824,197,005.91/70,908.81
  6. Step 6: Final answer
    x = 53,931.20

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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.