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Finding the Fourth Proportional to 415,975.40, 623,963.10 and 345,991.40

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Solution

The fourth proportional to 415,975.40, 623,963.10 and 345,991.40 is: 518,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    415,975.40 : 623,963.10 = 345,991.40 : x
  2. Step 2: Convert to fraction form
    415,975.40/623,963.10 = 345,991.40/x
  3. Step 3: Cross multiply
    415,975.40x = 623,963.10 × 345,991.40
  4. Step 4: Simplify right side
    415,975.40x = 215,885,866,517.34
  5. Step 5: Solve for x
    x = 215,885,866,517.34/415,975.40
  6. Step 6: Final answer
    x = 518,987.10

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Double scale
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Similar ratio
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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.