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Finding the Fourth Proportional to 128,239.83, 176,980.13 and 70,877.92

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Solution

The fourth proportional to 128,239.83, 176,980.13 and 70,877.92 is: 97,816.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.83 : 176,980.13 = 70,877.92 : x
  2. Step 2: Convert to fraction form
    128,239.83/176,980.13 = 70,877.92/x
  3. Step 3: Cross multiply
    128,239.83x = 176,980.13 × 70,877.92
  4. Step 4: Simplify right side
    128,239.83x = 12,543,983,495.73
  5. Step 5: Solve for x
    x = 12,543,983,495.73/128,239.83
  6. Step 6: Final answer
    x = 97,816.59

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1.5x scale

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.