Home / 30,975.64-42,781.62-20,886.76

Finding the Fourth Proportional to 30,975.64, 42,781.62 and 20,886.76

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Solution

The fourth proportional to 30,975.64, 42,781.62 and 20,886.76 is: 28,847.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,975.64 : 42,781.62 = 20,886.76 : x
  2. Step 2: Convert to fraction form
    30,975.64/42,781.62 = 20,886.76/x
  3. Step 3: Cross multiply
    30,975.64x = 42,781.62 × 20,886.76
  4. Step 4: Simplify right side
    30,975.64x = 893,569,429.35
  5. Step 5: Solve for x
    x = 893,569,429.35/30,975.64
  6. Step 6: Final answer
    x = 28,847.49

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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.