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Finding the Fourth Proportional to 229,207.50, 316,311.21 and 128,605.50

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Solution

The fourth proportional to 229,207.50, 316,311.21 and 128,605.50 is: 177,478.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    229,207.50 : 316,311.21 = 128,605.50 : x
  2. Step 2: Convert to fraction form
    229,207.50/316,311.21 = 128,605.50/x
  3. Step 3: Cross multiply
    229,207.50x = 316,311.21 × 128,605.50
  4. Step 4: Simplify right side
    229,207.50x = 40,679,361,317.66
  5. Step 5: Solve for x
    x = 40,679,361,317.66/229,207.50
  6. Step 6: Final answer
    x = 177,478.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.