Home / 31,140.04-42,928.80-20,511.22

Finding the Fourth Proportional to 31,140.04, 42,928.80 and 20,511.22

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Solution

The fourth proportional to 31,140.04, 42,928.80 and 20,511.22 is: 28,276.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,140.04 : 42,928.80 = 20,511.22 : x
  2. Step 2: Convert to fraction form
    31,140.04/42,928.80 = 20,511.22/x
  3. Step 3: Cross multiply
    31,140.04x = 42,928.80 × 20,511.22
  4. Step 4: Simplify right side
    31,140.04x = 880,522,061.14
  5. Step 5: Solve for x
    x = 880,522,061.14/31,140.04
  6. Step 6: Final answer
    x = 28,276.20

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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.