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Finding the Fourth Proportional to 280,319.74, 420,535 and 102,828.40

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Solution

The fourth proportional to 280,319.74, 420,535 and 102,828.40 is: 154,262.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,319.74 : 420,535 = 102,828.40 : x
  2. Step 2: Convert to fraction form
    280,319.74/420,535 = 102,828.40/x
  3. Step 3: Cross multiply
    280,319.74x = 420,535 × 102,828.40
  4. Step 4: Simplify right side
    280,319.74x = 43,242,941,194
  5. Step 5: Solve for x
    x = 43,242,941,194/280,319.74
  6. Step 6: Final answer
    x = 154,262.92

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1.5x scale

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.