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Finding the Fourth Proportional to 211,990.60, 317,985.90 and 54,210.70

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Solution

The fourth proportional to 211,990.60, 317,985.90 and 54,210.70 is: 81,316.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,990.60 : 317,985.90 = 54,210.70 : x
  2. Step 2: Convert to fraction form
    211,990.60/317,985.90 = 54,210.70/x
  3. Step 3: Cross multiply
    211,990.60x = 317,985.90 × 54,210.70
  4. Step 4: Simplify right side
    211,990.60x = 17,238,238,229.13
  5. Step 5: Solve for x
    x = 17,238,238,229.13/211,990.60
  6. Step 6: Final answer
    x = 81,316.05

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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.