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Finding the Fourth Proportional to 127,432, 175,639.40 and 87,075.72

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Solution

The fourth proportional to 127,432, 175,639.40 and 87,075.72 is: 120,016.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,432 : 175,639.40 = 87,075.72 : x
  2. Step 2: Convert to fraction form
    127,432/175,639.40 = 87,075.72/x
  3. Step 3: Cross multiply
    127,432x = 175,639.40 × 87,075.72
  4. Step 4: Simplify right side
    127,432x = 15,293,927,215.37
  5. Step 5: Solve for x
    x = 15,293,927,215.37/127,432
  6. Step 6: Final answer
    x = 120,016.38

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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.