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Finding the Fourth Proportional to 280,712.80, 387,379.02 and 153,385.48

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Solution

The fourth proportional to 280,712.80, 387,379.02 and 153,385.48 is: 211,669.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,712.80 : 387,379.02 = 153,385.48 : x
  2. Step 2: Convert to fraction form
    280,712.80/387,379.02 = 153,385.48/x
  3. Step 3: Cross multiply
    280,712.80x = 387,379.02 × 153,385.48
  4. Step 4: Simplify right side
    280,712.80x = 59,418,316,924.63
  5. Step 5: Solve for x
    x = 59,418,316,924.63/280,712.80
  6. Step 6: Final answer
    x = 211,669.42

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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.