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Finding the Fourth Proportional to 63,800.51, 87,987.38 and 39,929.40

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Solution

The fourth proportional to 63,800.51, 87,987.38 and 39,929.40 is: 55,066.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,800.51 : 87,987.38 = 39,929.40 : x
  2. Step 2: Convert to fraction form
    63,800.51/87,987.38 = 39,929.40/x
  3. Step 3: Cross multiply
    63,800.51x = 87,987.38 × 39,929.40
  4. Step 4: Simplify right side
    63,800.51x = 3,513,283,091.33
  5. Step 5: Solve for x
    x = 3,513,283,091.33/63,800.51
  6. Step 6: Final answer
    x = 55,066.70

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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.