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Finding the Fourth Proportional to 280,355.40, 420,533.10 and 280,355.40

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Solution

The fourth proportional to 280,355.40, 420,533.10 and 280,355.40 is: 420,533.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,355.40 : 420,533.10 = 280,355.40 : x
  2. Step 2: Convert to fraction form
    280,355.40/420,533.10 = 280,355.40/x
  3. Step 3: Cross multiply
    280,355.40x = 420,533.10 × 280,355.40
  4. Step 4: Simplify right side
    280,355.40x = 117,898,725,463.74
  5. Step 5: Solve for x
    x = 117,898,725,463.74/280,355.40
  6. Step 6: Final answer
    x = 420,533.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.