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Finding the Fourth Proportional to 613,706.40, 920,685.33 and 258,721.05

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Solution

The fourth proportional to 613,706.40, 920,685.33 and 258,721.05 is: 388,134.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,706.40 : 920,685.33 = 258,721.05 : x
  2. Step 2: Convert to fraction form
    613,706.40/920,685.33 = 258,721.05/x
  3. Step 3: Cross multiply
    613,706.40x = 920,685.33 × 258,721.05
  4. Step 4: Simplify right side
    613,706.40x = 238,200,675,297.20
  5. Step 5: Solve for x
    x = 238,200,675,297.20/613,706.40
  6. Step 6: Final answer
    x = 388,134.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.