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Finding the Fourth Proportional to 280,686.51, 387,353.21 and 153,370.53

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Solution

The fourth proportional to 280,686.51, 387,353.21 and 153,370.53 is: 211,654.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,686.51 : 387,353.21 = 153,370.53 : x
  2. Step 2: Convert to fraction form
    280,686.51/387,353.21 = 153,370.53/x
  3. Step 3: Cross multiply
    280,686.51x = 387,353.21 × 153,370.53
  4. Step 4: Simplify right side
    280,686.51x = 59,408,566,348.05
  5. Step 5: Solve for x
    x = 59,408,566,348.05/280,686.51
  6. Step 6: Final answer
    x = 211,654.51

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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.