Home / 31,140.15-42,980.28-19,807.44

Finding the Fourth Proportional to 31,140.15, 42,980.28 and 19,807.44

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Solution

The fourth proportional to 31,140.15, 42,980.28 and 19,807.44 is: 27,338.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,140.15 : 42,980.28 = 19,807.44 : x
  2. Step 2: Convert to fraction form
    31,140.15/42,980.28 = 19,807.44/x
  3. Step 3: Cross multiply
    31,140.15x = 42,980.28 × 19,807.44
  4. Step 4: Simplify right side
    31,140.15x = 851,329,317.28
  5. Step 5: Solve for x
    x = 851,329,317.28/31,140.15
  6. Step 6: Final answer
    x = 27,338.64

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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.