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Finding the Fourth Proportional to 128,609.31, 177,478.93 and 71,248.51

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Solution

The fourth proportional to 128,609.31, 177,478.93 and 71,248.51 is: 98,321.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,609.31 : 177,478.93 = 71,248.51 : x
  2. Step 2: Convert to fraction form
    128,609.31/177,478.93 = 71,248.51/x
  3. Step 3: Cross multiply
    128,609.31x = 177,478.93 × 71,248.51
  4. Step 4: Simplify right side
    128,609.31x = 12,645,108,075.26
  5. Step 5: Solve for x
    x = 12,645,108,075.26/128,609.31
  6. Step 6: Final answer
    x = 98,321.88

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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.