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Finding the Fourth Proportional to 85,626.70, 128,490.78 and 47,707.72

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Solution

The fourth proportional to 85,626.70, 128,490.78 and 47,707.72 is: 71,589.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,626.70 : 128,490.78 = 47,707.72 : x
  2. Step 2: Convert to fraction form
    85,626.70/128,490.78 = 47,707.72/x
  3. Step 3: Cross multiply
    85,626.70x = 128,490.78 × 47,707.72
  4. Step 4: Simplify right side
    85,626.70x = 6,130,002,154.82
  5. Step 5: Solve for x
    x = 6,130,002,154.82/85,626.70
  6. Step 6: Final answer
    x = 71,589.84

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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.