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Finding the Fourth Proportional to 64,810.80, 89,412.60 and 39,674.88

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Solution

The fourth proportional to 64,810.80, 89,412.60 and 39,674.88 is: 54,735.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,810.80 : 89,412.60 = 39,674.88 : x
  2. Step 2: Convert to fraction form
    64,810.80/89,412.60 = 39,674.88/x
  3. Step 3: Cross multiply
    64,810.80x = 89,412.60 × 39,674.88
  4. Step 4: Simplify right side
    64,810.80x = 3,547,434,175.49
  5. Step 5: Solve for x
    x = 3,547,434,175.49/64,810.80
  6. Step 6: Final answer
    x = 54,735.23

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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.