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Finding the Fourth Proportional to 65,390.58, 90,214.92 and 39,888.36

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Solution

The fourth proportional to 65,390.58, 90,214.92 and 39,888.36 is: 55,031.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,390.58 : 90,214.92 = 39,888.36 : x
  2. Step 2: Convert to fraction form
    65,390.58/90,214.92 = 39,888.36/x
  3. Step 3: Cross multiply
    65,390.58x = 90,214.92 × 39,888.36
  4. Step 4: Simplify right side
    65,390.58x = 3,598,525,206.33
  5. Step 5: Solve for x
    x = 3,598,525,206.33/65,390.58
  6. Step 6: Final answer
    x = 55,031.25

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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.