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Finding the Fourth Proportional to 128,071.34, 176,731.26 and 71,486.36

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Solution

The fourth proportional to 128,071.34, 176,731.26 and 71,486.36 is: 98,647.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,071.34 : 176,731.26 = 71,486.36 : x
  2. Step 2: Convert to fraction form
    128,071.34/176,731.26 = 71,486.36/x
  3. Step 3: Cross multiply
    128,071.34x = 176,731.26 × 71,486.36
  4. Step 4: Simplify right side
    128,071.34x = 12,633,874,475.61
  5. Step 5: Solve for x
    x = 12,633,874,475.61/128,071.34
  6. Step 6: Final answer
    x = 98,647.16

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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.