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Finding the Fourth Proportional to 717,912.61, 990,706.64 and 391,228.54

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Solution

The fourth proportional to 717,912.61, 990,706.64 and 391,228.54 is: 539,888.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,912.61 : 990,706.64 = 391,228.54 : x
  2. Step 2: Convert to fraction form
    717,912.61/990,706.64 = 391,228.54/x
  3. Step 3: Cross multiply
    717,912.61x = 990,706.64 × 391,228.54
  4. Step 4: Simplify right side
    717,912.61x = 387,592,707,902.60
  5. Step 5: Solve for x
    x = 387,592,707,902.60/717,912.61
  6. Step 6: Final answer
    x = 539,888.43

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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.