Home / 128,929.76-177,926.12-72,345.32

Finding the Fourth Proportional to 128,929.76, 177,926.12 and 72,345.32

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Solution

The fourth proportional to 128,929.76, 177,926.12 and 72,345.32 is: 99,838.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,929.76 : 177,926.12 = 72,345.32 : x
  2. Step 2: Convert to fraction form
    128,929.76/177,926.12 = 72,345.32/x
  3. Step 3: Cross multiply
    128,929.76x = 177,926.12 × 72,345.32
  4. Step 4: Simplify right side
    128,929.76x = 12,872,122,087.76
  5. Step 5: Solve for x
    x = 12,872,122,087.76/128,929.76
  6. Step 6: Final answer
    x = 99,838.25

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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.