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Finding the Fourth Proportional to 280,275.49, 386,679.04 and 215,764.48

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Solution

The fourth proportional to 280,275.49, 386,679.04 and 215,764.48 is: 297,677.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,275.49 : 386,679.04 = 215,764.48 : x
  2. Step 2: Convert to fraction form
    280,275.49/386,679.04 = 215,764.48/x
  3. Step 3: Cross multiply
    280,275.49x = 386,679.04 × 215,764.48
  4. Step 4: Simplify right side
    280,275.49x = 83,431,601,992.50
  5. Step 5: Solve for x
    x = 83,431,601,992.50/280,275.49
  6. Step 6: Final answer
    x = 297,677.12

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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.