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Finding the Fourth Proportional to 646,987.70, 970,481.55 and 423,038.90

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Solution

The fourth proportional to 646,987.70, 970,481.55 and 423,038.90 is: 634,558.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,987.70 : 970,481.55 = 423,038.90 : x
  2. Step 2: Convert to fraction form
    646,987.70/970,481.55 = 423,038.90/x
  3. Step 3: Cross multiply
    646,987.70x = 970,481.55 × 423,038.90
  4. Step 4: Simplify right side
    646,987.70x = 410,551,447,382.30
  5. Step 5: Solve for x
    x = 410,551,447,382.30/646,987.70
  6. Step 6: Final answer
    x = 634,558.35

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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.