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Finding the Fourth Proportional to 129,928.50, 179,301.42 and 70,312.50

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Solution

The fourth proportional to 129,928.50, 179,301.42 and 70,312.50 is: 97,031.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,928.50 : 179,301.42 = 70,312.50 : x
  2. Step 2: Convert to fraction form
    129,928.50/179,301.42 = 70,312.50/x
  3. Step 3: Cross multiply
    129,928.50x = 179,301.42 × 70,312.50
  4. Step 4: Simplify right side
    129,928.50x = 12,607,131,093.75
  5. Step 5: Solve for x
    x = 12,607,131,093.75/129,928.50
  6. Step 6: Final answer
    x = 97,031.30

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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.