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Finding the Fourth Proportional to 643,967.10, 965,950.65 and 455,010.30

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Solution

The fourth proportional to 643,967.10, 965,950.65 and 455,010.30 is: 682,515.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,967.10 : 965,950.65 = 455,010.30 : x
  2. Step 2: Convert to fraction form
    643,967.10/965,950.65 = 455,010.30/x
  3. Step 3: Cross multiply
    643,967.10x = 965,950.65 × 455,010.30
  4. Step 4: Simplify right side
    643,967.10x = 439,517,495,041.70
  5. Step 5: Solve for x
    x = 439,517,495,041.70/643,967.10
  6. Step 6: Final answer
    x = 682,515.45

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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.