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Finding the Fourth Proportional to 212,636.80, 318,955.20 and 86,276.80

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Solution

The fourth proportional to 212,636.80, 318,955.20 and 86,276.80 is: 129,415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,636.80 : 318,955.20 = 86,276.80 : x
  2. Step 2: Convert to fraction form
    212,636.80/318,955.20 = 86,276.80/x
  3. Step 3: Cross multiply
    212,636.80x = 318,955.20 × 86,276.80
  4. Step 4: Simplify right side
    212,636.80x = 27,518,433,999.36
  5. Step 5: Solve for x
    x = 27,518,433,999.36/212,636.80
  6. Step 6: Final answer
    x = 129,415.20

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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.