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Finding the Fourth Proportional to 86,585.80, 129,878.70 and 72,005.80

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Solution

The fourth proportional to 86,585.80, 129,878.70 and 72,005.80 is: 108,008.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,585.80 : 129,878.70 = 72,005.80 : x
  2. Step 2: Convert to fraction form
    86,585.80/129,878.70 = 72,005.80/x
  3. Step 3: Cross multiply
    86,585.80x = 129,878.70 × 72,005.80
  4. Step 4: Simplify right side
    86,585.80x = 9,352,019,696.46
  5. Step 5: Solve for x
    x = 9,352,019,696.46/86,585.80
  6. Step 6: Final answer
    x = 108,008.70

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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.