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Finding the Fourth Proportional to 211,988.40, 317,399.40 and 201,490.80

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Solution

The fourth proportional to 211,988.40, 317,399.40 and 201,490.80 is: 301,681.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,988.40 : 317,399.40 = 201,490.80 : x
  2. Step 2: Convert to fraction form
    211,988.40/317,399.40 = 201,490.80/x
  3. Step 3: Cross multiply
    211,988.40x = 317,399.40 × 201,490.80
  4. Step 4: Simplify right side
    211,988.40x = 63,953,059,025.52
  5. Step 5: Solve for x
    x = 63,953,059,025.52/211,988.40
  6. Step 6: Final answer
    x = 301,681.88

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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.