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Finding the Fourth Proportional to 280,753.21, 387,439.59 and 153,428.81

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Solution

The fourth proportional to 280,753.21, 387,439.59 and 153,428.81 is: 211,731.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,753.21 : 387,439.59 = 153,428.81 : x
  2. Step 2: Convert to fraction form
    280,753.21/387,439.59 = 153,428.81/x
  3. Step 3: Cross multiply
    280,753.21x = 387,439.59 × 153,428.81
  4. Step 4: Simplify right side
    280,753.21x = 59,444,393,878.75
  5. Step 5: Solve for x
    x = 59,444,393,878.75/280,753.21
  6. Step 6: Final answer
    x = 211,731.84

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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.