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Finding the Fourth Proportional to 286,672.40, 430,057.20 and 86,991.20

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Solution

The fourth proportional to 286,672.40, 430,057.20 and 86,991.20 is: 130,501.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    286,672.40 : 430,057.20 = 86,991.20 : x
  2. Step 2: Convert to fraction form
    286,672.40/430,057.20 = 86,991.20/x
  3. Step 3: Cross multiply
    286,672.40x = 430,057.20 × 86,991.20
  4. Step 4: Simplify right side
    286,672.40x = 37,411,191,896.64
  5. Step 5: Solve for x
    x = 37,411,191,896.64/286,672.40
  6. Step 6: Final answer
    x = 130,501.55

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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.