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Finding the Fourth Proportional to 130,239, 179,729.90 and 70,623

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Solution

The fourth proportional to 130,239, 179,729.90 and 70,623 is: 97,459.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,239 : 179,729.90 = 70,623 : x
  2. Step 2: Convert to fraction form
    130,239/179,729.90 = 70,623/x
  3. Step 3: Cross multiply
    130,239x = 179,729.90 × 70,623
  4. Step 4: Simplify right side
    130,239x = 12,693,064,727.70
  5. Step 5: Solve for x
    x = 12,693,064,727.70/130,239
  6. Step 6: Final answer
    x = 97,459.78

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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.