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Finding the Fourth Proportional to 642,497.80, 963,746.70 and 343,899.40

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Solution

The fourth proportional to 642,497.80, 963,746.70 and 343,899.40 is: 515,849.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,497.80 : 963,746.70 = 343,899.40 : x
  2. Step 2: Convert to fraction form
    642,497.80/963,746.70 = 343,899.40/x
  3. Step 3: Cross multiply
    642,497.80x = 963,746.70 × 343,899.40
  4. Step 4: Simplify right side
    642,497.80x = 331,431,911,881.98
  5. Step 5: Solve for x
    x = 331,431,911,881.98/642,497.80
  6. Step 6: Final answer
    x = 515,849.10

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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.