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Finding the Fourth Proportional to 312,134.72, 430,742.68 and 168,891.60

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Solution

The fourth proportional to 312,134.72, 430,742.68 and 168,891.60 is: 233,068.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,134.72 : 430,742.68 = 168,891.60 : x
  2. Step 2: Convert to fraction form
    312,134.72/430,742.68 = 168,891.60/x
  3. Step 3: Cross multiply
    312,134.72x = 430,742.68 × 168,891.60
  4. Step 4: Simplify right side
    312,134.72x = 72,748,820,413.49
  5. Step 5: Solve for x
    x = 72,748,820,413.49/312,134.72
  6. Step 6: Final answer
    x = 233,068.66

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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.