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Finding the Fourth Proportional to 280,404.80, 386,964.48 and 153,085.76

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Solution

The fourth proportional to 280,404.80, 386,964.48 and 153,085.76 is: 211,261.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,404.80 : 386,964.48 = 153,085.76 : x
  2. Step 2: Convert to fraction form
    280,404.80/386,964.48 = 153,085.76/x
  3. Step 3: Cross multiply
    280,404.80x = 386,964.48 × 153,085.76
  4. Step 4: Simplify right side
    280,404.80x = 59,238,751,513.80
  5. Step 5: Solve for x
    x = 59,238,751,513.80/280,404.80
  6. Step 6: Final answer
    x = 211,261.55

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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.