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Finding the Fourth Proportional to 136,012.80, 187,643.88 and 78,641.60

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Solution

The fourth proportional to 136,012.80, 187,643.88 and 78,641.60 is: 108,494.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,012.80 : 187,643.88 = 78,641.60 : x
  2. Step 2: Convert to fraction form
    136,012.80/187,643.88 = 78,641.60/x
  3. Step 3: Cross multiply
    136,012.80x = 187,643.88 × 78,641.60
  4. Step 4: Simplify right side
    136,012.80x = 14,756,614,953.41
  5. Step 5: Solve for x
    x = 14,756,614,953.41/136,012.80
  6. Step 6: Final answer
    x = 108,494.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.