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Finding the Fourth Proportional to 647,699.40, 971,549.10 and 423,313.20

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Solution

The fourth proportional to 647,699.40, 971,549.10 and 423,313.20 is: 634,969.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,699.40 : 971,549.10 = 423,313.20 : x
  2. Step 2: Convert to fraction form
    647,699.40/971,549.10 = 423,313.20/x
  3. Step 3: Cross multiply
    647,699.40x = 971,549.10 × 423,313.20
  4. Step 4: Simplify right side
    647,699.40x = 411,269,558,478.12
  5. Step 5: Solve for x
    x = 411,269,558,478.12/647,699.40
  6. Step 6: Final answer
    x = 634,969.80

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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.