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Finding the Fourth Proportional to 199,611.60, 299,417.40 and 128,752.80

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Solution

The fourth proportional to 199,611.60, 299,417.40 and 128,752.80 is: 193,129.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,611.60 : 299,417.40 = 128,752.80 : x
  2. Step 2: Convert to fraction form
    199,611.60/299,417.40 = 128,752.80/x
  3. Step 3: Cross multiply
    199,611.60x = 299,417.40 × 128,752.80
  4. Step 4: Simplify right side
    199,611.60x = 38,550,828,618.72
  5. Step 5: Solve for x
    x = 38,550,828,618.72/199,611.60
  6. Step 6: Final answer
    x = 193,129.20

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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.