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Finding the Fourth Proportional to 280,618.52, 387,248.70 and 153,290.84

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Solution

The fourth proportional to 280,618.52, 387,248.70 and 153,290.84 is: 211,538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,618.52 : 387,248.70 = 153,290.84 : x
  2. Step 2: Convert to fraction form
    280,618.52/387,248.70 = 153,290.84/x
  3. Step 3: Cross multiply
    280,618.52x = 387,248.70 × 153,290.84
  4. Step 4: Simplify right side
    280,618.52x = 59,361,678,511.91
  5. Step 5: Solve for x
    x = 59,361,678,511.91/280,618.52
  6. Step 6: Final answer
    x = 211,538.71

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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.