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Finding the Fourth Proportional to 642,406.10, 963,609.15 and 617,911.70

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Solution

The fourth proportional to 642,406.10, 963,609.15 and 617,911.70 is: 926,867.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,406.10 : 963,609.15 = 617,911.70 : x
  2. Step 2: Convert to fraction form
    642,406.10/963,609.15 = 617,911.70/x
  3. Step 3: Cross multiply
    642,406.10x = 963,609.15 × 617,911.70
  4. Step 4: Simplify right side
    642,406.10x = 595,425,368,012.06
  5. Step 5: Solve for x
    x = 595,425,368,012.06/642,406.10
  6. Step 6: Final answer
    x = 926,867.55

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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.