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Finding the Fourth Proportional to 131,428.90, 197,240.55 and 87,040.90

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Solution

The fourth proportional to 131,428.90, 197,240.55 and 87,040.90 is: 130,625.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,428.90 : 197,240.55 = 87,040.90 : x
  2. Step 2: Convert to fraction form
    131,428.90/197,240.55 = 87,040.90/x
  3. Step 3: Cross multiply
    131,428.90x = 197,240.55 × 87,040.90
  4. Step 4: Simplify right side
    131,428.90x = 17,167,994,988.50
  5. Step 5: Solve for x
    x = 17,167,994,988.50/131,428.90
  6. Step 6: Final answer
    x = 130,625.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.