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Finding the Fourth Proportional to 312,528.18, 431,289.99 and 169,287.78

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Solution

The fourth proportional to 312,528.18, 431,289.99 and 169,287.78 is: 233,617.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,528.18 : 431,289.99 = 169,287.78 : x
  2. Step 2: Convert to fraction form
    312,528.18/431,289.99 = 169,287.78/x
  3. Step 3: Cross multiply
    312,528.18x = 431,289.99 × 169,287.78
  4. Step 4: Simplify right side
    312,528.18x = 73,012,124,943.32
  5. Step 5: Solve for x
    x = 73,012,124,943.32/312,528.18
  6. Step 6: Final answer
    x = 233,617.73

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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.