Home / 128,746.12-177,688.03-71,398.20

Finding the Fourth Proportional to 128,746.12, 177,688.03 and 71,398.20

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Solution

The fourth proportional to 128,746.12, 177,688.03 and 71,398.20 is: 98,539.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,746.12 : 177,688.03 = 71,398.20 : x
  2. Step 2: Convert to fraction form
    128,746.12/177,688.03 = 71,398.20/x
  3. Step 3: Cross multiply
    128,746.12x = 177,688.03 × 71,398.20
  4. Step 4: Simplify right side
    128,746.12x = 12,686,604,926.46
  5. Step 5: Solve for x
    x = 12,686,604,926.46/128,746.12
  6. Step 6: Final answer
    x = 98,539.71

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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.