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Finding the Fourth Proportional to 64,813.80, 89,416.74 and 39,677.88

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Solution

The fourth proportional to 64,813.80, 89,416.74 and 39,677.88 is: 54,739.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,813.80 : 89,416.74 = 39,677.88 : x
  2. Step 2: Convert to fraction form
    64,813.80/89,416.74 = 39,677.88/x
  3. Step 3: Cross multiply
    64,813.80x = 89,416.74 × 39,677.88
  4. Step 4: Simplify right side
    64,813.80x = 3,547,866,679.71
  5. Step 5: Solve for x
    x = 3,547,866,679.71/64,813.80
  6. Step 6: Final answer
    x = 54,739.37

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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.