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Finding the Fourth Proportional to 128,090.84, 176,764.92 and 71,501.72

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Solution

The fourth proportional to 128,090.84, 176,764.92 and 71,501.72 is: 98,672.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,090.84 : 176,764.92 = 71,501.72 : x
  2. Step 2: Convert to fraction form
    128,090.84/176,764.92 = 71,501.72/x
  3. Step 3: Cross multiply
    128,090.84x = 176,764.92 × 71,501.72
  4. Step 4: Simplify right side
    128,090.84x = 12,638,995,815.66
  5. Step 5: Solve for x
    x = 12,638,995,815.66/128,090.84
  6. Step 6: Final answer
    x = 98,672.13

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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.