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Finding the Fourth Proportional to 717,702.44, 990,424.56 and 395,405

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Solution

The fourth proportional to 717,702.44, 990,424.56 and 395,405 is: 545,656.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,702.44 : 990,424.56 = 395,405 : x
  2. Step 2: Convert to fraction form
    717,702.44/990,424.56 = 395,405/x
  3. Step 3: Cross multiply
    717,702.44x = 990,424.56 × 395,405
  4. Step 4: Simplify right side
    717,702.44x = 391,618,823,146.80
  5. Step 5: Solve for x
    x = 391,618,823,146.80/717,702.44
  6. Step 6: Final answer
    x = 545,656.25

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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.