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Finding the Fourth Proportional to 86,490.70, 129,736.05 and 47,124.70

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Solution

The fourth proportional to 86,490.70, 129,736.05 and 47,124.70 is: 70,687.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,490.70 : 129,736.05 = 47,124.70 : x
  2. Step 2: Convert to fraction form
    86,490.70/129,736.05 = 47,124.70/x
  3. Step 3: Cross multiply
    86,490.70x = 129,736.05 × 47,124.70
  4. Step 4: Simplify right side
    86,490.70x = 6,113,772,435.44
  5. Step 5: Solve for x
    x = 6,113,772,435.44/86,490.70
  6. Step 6: Final answer
    x = 70,687.05

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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.