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Finding the Fourth Proportional to 86,790.60, 130,185.90 and 42,445.80

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Solution

The fourth proportional to 86,790.60, 130,185.90 and 42,445.80 is: 63,668.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,790.60 : 130,185.90 = 42,445.80 : x
  2. Step 2: Convert to fraction form
    86,790.60/130,185.90 = 42,445.80/x
  3. Step 3: Cross multiply
    86,790.60x = 130,185.90 × 42,445.80
  4. Step 4: Simplify right side
    86,790.60x = 5,525,844,674.22
  5. Step 5: Solve for x
    x = 5,525,844,674.22/86,790.60
  6. Step 6: Final answer
    x = 63,668.70

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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.