Home / 39,890.47-55,047.77-21,985.47

Finding the Fourth Proportional to 39,890.47, 55,047.77 and 21,985.47

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Solution

The fourth proportional to 39,890.47, 55,047.77 and 21,985.47 is: 30,339.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,890.47 : 55,047.77 = 21,985.47 : x
  2. Step 2: Convert to fraction form
    39,890.47/55,047.77 = 21,985.47/x
  3. Step 3: Cross multiply
    39,890.47x = 55,047.77 × 21,985.47
  4. Step 4: Simplify right side
    39,890.47x = 1,210,251,095.90
  5. Step 5: Solve for x
    x = 1,210,251,095.90/39,890.47
  6. Step 6: Final answer
    x = 30,339.35

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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.