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Finding the Fourth Proportional to 86,696.80, 130,045.20 and 45,138.40

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Solution

The fourth proportional to 86,696.80, 130,045.20 and 45,138.40 is: 67,707.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,696.80 : 130,045.20 = 45,138.40 : x
  2. Step 2: Convert to fraction form
    86,696.80/130,045.20 = 45,138.40/x
  3. Step 3: Cross multiply
    86,696.80x = 130,045.20 × 45,138.40
  4. Step 4: Simplify right side
    86,696.80x = 5,870,032,255.68
  5. Step 5: Solve for x
    x = 5,870,032,255.68/86,696.80
  6. Step 6: Final answer
    x = 67,707.60

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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.