Home / 30,976.64-42,783-20,887.76

Finding the Fourth Proportional to 30,976.64, 42,783 and 20,887.76

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Solution

The fourth proportional to 30,976.64, 42,783 and 20,887.76 is: 28,848.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,976.64 : 42,783 = 20,887.76 : x
  2. Step 2: Convert to fraction form
    30,976.64/42,783 = 20,887.76/x
  3. Step 3: Cross multiply
    30,976.64x = 42,783 × 20,887.76
  4. Step 4: Simplify right side
    30,976.64x = 893,641,036.08
  5. Step 5: Solve for x
    x = 893,641,036.08/30,976.64
  6. Step 6: Final answer
    x = 28,848.87

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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.