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Finding the Fourth Proportional to 64,839.66, 89,465.16 and 39,359.36

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Solution

The fourth proportional to 64,839.66, 89,465.16 and 39,359.36 is: 54,307.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,839.66 : 89,465.16 = 39,359.36 : x
  2. Step 2: Convert to fraction form
    64,839.66/89,465.16 = 39,359.36/x
  3. Step 3: Cross multiply
    64,839.66x = 89,465.16 × 39,359.36
  4. Step 4: Simplify right side
    64,839.66x = 3,521,291,439.90
  5. Step 5: Solve for x
    x = 3,521,291,439.90/64,839.66
  6. Step 6: Final answer
    x = 54,307.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.