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Finding the Fourth Proportional to 286,321.40, 429,530.70 and 86,640.20

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Solution

The fourth proportional to 286,321.40, 429,530.70 and 86,640.20 is: 129,975.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,321.40 : 429,530.70 = 86,640.20 : x
  2. Step 2: Convert to fraction form
    286,321.40/429,530.70 = 86,640.20/x
  3. Step 3: Cross multiply
    286,321.40x = 429,530.70 × 86,640.20
  4. Step 4: Simplify right side
    286,321.40x = 37,214,625,754.14
  5. Step 5: Solve for x
    x = 37,214,625,754.14/286,321.40
  6. Step 6: Final answer
    x = 129,975.01

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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.