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Finding the Fourth Proportional to 128,421.10, 177,209.04 and 86,943.74

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Solution

The fourth proportional to 128,421.10, 177,209.04 and 86,943.74 is: 119,974.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.10 : 177,209.04 = 86,943.74 : x
  2. Step 2: Convert to fraction form
    128,421.10/177,209.04 = 86,943.74/x
  3. Step 3: Cross multiply
    128,421.10x = 177,209.04 × 86,943.74
  4. Step 4: Simplify right side
    128,421.10x = 15,407,216,139.40
  5. Step 5: Solve for x
    x = 15,407,216,139.40/128,421.10
  6. Step 6: Final answer
    x = 119,974.18

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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.