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Finding the Fourth Proportional to 278,721.39, 384,642.64 and 157,860.89

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Solution

The fourth proportional to 278,721.39, 384,642.64 and 157,860.89 is: 217,852.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,721.39 : 384,642.64 = 157,860.89 : x
  2. Step 2: Convert to fraction form
    278,721.39/384,642.64 = 157,860.89/x
  3. Step 3: Cross multiply
    278,721.39x = 384,642.64 × 157,860.89
  4. Step 4: Simplify right side
    278,721.39x = 60,720,029,482.35
  5. Step 5: Solve for x
    x = 60,720,029,482.35/278,721.39
  6. Step 6: Final answer
    x = 217,852.06

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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.