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Finding the Fourth Proportional to 280,693.21, 387,356.30 and 151,631.66

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Solution

The fourth proportional to 280,693.21, 387,356.30 and 151,631.66 is: 209,251.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,693.21 : 387,356.30 = 151,631.66 : x
  2. Step 2: Convert to fraction form
    280,693.21/387,356.30 = 151,631.66/x
  3. Step 3: Cross multiply
    280,693.21x = 387,356.30 × 151,631.66
  4. Step 4: Simplify right side
    280,693.21x = 58,735,478,780.46
  5. Step 5: Solve for x
    x = 58,735,478,780.46/280,693.21
  6. Step 6: Final answer
    x = 209,251.51

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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.